Malicious PDF — malware analysis report

Static analysis result for SHA-256 959974ec47307f2d…

MALICIOUS

PDF

102.0 KB Created: 2021-04-25 16:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4f4c8289efe17a4e2443a28c318501d3 SHA-1: d5928f1da013e46d3a3000e8b1cf6f7bc8d03e42 SHA-256: 959974ec47307f2dc16a159b54af386ae70da98012f139bcb4d11531bcc77376
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=diablo+3+strategy+guide In PDF document text
    • https://cdn.sqhk.co/papebikuwi/jfjmY8f/31184664087.pdfIn PDF document text
    • http://gozuwifaw.iblogger.org/dukazevululosebuweturib.pdfIn PDF document text
    • http://dabobez.22web.org/putovowuvomowidi.pdfIn PDF document text
    • http://wumijodurixemi.22web.org/rewoz.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/iegdcii/brain_over_tricky_puzzles_level_10.pdfIn PDF document text
    • http://jokidinavefo.22web.org/6671667996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mibesajaku.epizy.com/7251338899.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_5d7a0622de914f7ea7cdfbc43eccfc7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3c3790-027d-431a-a29e-523e4a5f9056/what_are_the_most_winningest_lottery_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdcb4d5-a9d1-4d3f-bdd5-7017ec8bf378/18048238064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5253a8e-c841-4dd4-85f0-38a22b95107e/reaccin_qumica_de_combustin_del_butano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34bfadc4-7a60-40bf-979d-1a71fab9c5c4/30352120844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42201b0b-cf51-4b9f-af08-68e4a7c2e34c/33091614473.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_386d5193125547f79e827fd819233e38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/852688bc-84d9-48fa-bdf3-f47b1344825e/maxi_dress_for_daytime_wedding_in_pakistan.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_3bfe29782979472ba21afd8b8e2d6e16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e53bc6-4a65-496a-8f0d-c6a4e54f6c05/womedifabadadu.pdfIn PDF document text
    • http://fafusew.rf.gd/sanjay_agarwal_costing_book_ca_final.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e57dc15-48a4-4643-b643-11ebd9460d22/99417552269.pdfIn PDF document text
    • http://pulijivugis.epizy.com/91768481549.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AC 5172 bytes
SHA-256: 49e09edbdeae3e0dc93b3d4e382d32cf20f4212b2a22f6a7c0f3281828e76154
font_01_sfnt_off0001564f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564F 11428 bytes
SHA-256: 066bd94a3933f30f1d27593d26db30ec6baf0fcf8f2883587351785eac2a1742
font_02_sfnt_off00017ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CED 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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