Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac003727a075d3f…

MALICIOUS

PDF

73.3 KB Created: 2021-04-05 13:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 485a503db82aec72935f5b0469c00203 SHA-1: b8e603f6e3716cced320e3f6695449d5fce4470c SHA-256: 5ac003727a075d3f45ffab4b9e80fc5eda702276d99bcdef6c52b3da83b8bb8a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://golowaki.ru/123?utm_term=batman+cavaleiro+das+trevas+parte+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378599/normal_604e8632a2cea.pdfIn PDF document text
    • http://mizarujil.mypressonline.com/sesul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_600ffd5e33c37.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/39670990573.pdfIn PDF document text
    • http://hookup753.fun/wixavedikogakl5j4.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/biochemistry_books_by_satyanarayana.pdfIn PDF document text
    • http://prizinsta.info/36719764277osf7m.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/action_verb_worksheet_for_grade_2.pdfIn PDF document text
    • http://housefashion.ru/aveiro_mapfvyh8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_633b51af3a1a40a9a41082ce771596b7.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_b41aa74daf3f4361927dcca1aeacf304.pdf?index=trueIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_5277e80bf6724a09b0d2c512bfb709fc.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_070f6a4caa834da6a35abef576feb214.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40552bd-4d47-491c-a9c9-5862e9e98c0a/20_verbos_en_ingles_y_espaol_regulares_e_irregulares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9cc231-c010-4ecb-8cf2-d7692d0c1367/astro_a20_xbox_one_mic_not_working.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_51f52e6b055949ec8ee712bdba083455.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_2923c84e78c64e239e3d239cad6e13a7.pdf?index=trueIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/93850549503.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_a75e60136da84f66a88aa2cffb6d7245.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba4981e-23f3-46f3-8825-5ae784921e48/44665811951.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 5460 bytes
SHA-256: b19881d564df14929f858e5410e3546d74427e9908abbb2ea8c167bf3e25cfbf
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 13664 bytes
SHA-256: 9ff73f744cfe6fd9a6af72854492462b45d4ae9be11556229e007282c0d5483f

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