Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dc3039d251d264…

MALICIOUS

PDF

95.5 KB Created: 2021-04-03 04:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 05cd0973a994c097b637803189b896e1 SHA-1: d7554a7cdd9554c3fb7a4a083180b6442522c056 SHA-256: b4dc3039d251d264b94b3c35d05c9a74ede3224ed93737bb4a65b2975b13386d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=karmasangsthan+bengali+paper+pdf+download PDF link annotation
    • http://zifeladawu.scienceontheweb.net/74051002332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60147d54eb521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fc84262a0723.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/56655293525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413240/normal_5fed352882ce3.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/puxesazorugupanozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fc7f01594b37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fd065d8de5da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e714bd-d8a3-4686-ad3f-8359a625f688/kaba_keypad_lock_battery_replacement.pdfIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_e7ced7f3489f45b0bd075daf0997abee.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_63aa28cece1249af81def169ccc0901b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9cd87ba-feb1-4bed-887b-91d608fdd037/nukugiwijewu.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_4fc96a404dd54a4a9e1149f0b9711c78.pdf?index=trueIn PDF document text
    • http://zapusov.atwebpages.com/completed_construction_business_plan.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/narakanepifip.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/5th_grade_nwea_math_practice_tests.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_6cd3904d9bb2421a93e2ef74b4c988c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21706c3-78cb-4945-bcc3-1cedde46983e/zojusagurar.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_b6f7163e49404bc4ad1408a5507af393.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_8746aaa713aa4ffe96e412b1f899354e.pdf?index=trueIn PDF document text
    • http://xemigososefof.atwebpages.com/banned_books_list.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_7d8e28b50ad7488d8f80b32e97b1742c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 2988 bytes
SHA-256: d774ea35627c636b60b67efcb19233550797bc3630d6d7476e68a1591658f61e
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 5656 bytes
SHA-256: 7892dab8166183d0c603e5bce870a7f412cdcf5b30acfce4eb80a28f08bba426
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 13440 bytes
SHA-256: 90fdef2bbf09d79ad2145baa6ef0a620b8824e89e14255f1816334c3e1b7379b
font_03_sfnt_off00013e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E45 2212 bytes
SHA-256: 79777cc3bf14d7c36a1b02e3a6eec7776755bc8dd20168ec0a9c245fb2c46eda
font_04_sfnt_off00014860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14860 10620 bytes
SHA-256: b3e4b1f3909640aab7c502ec839eae3526dbf0d7a4c187a74c6379d4474473a8

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