Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c0edf46cba9e8c…

MALICIOUS

PDF

90.4 KB Created: 2021-05-03 12:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8dda1a59e095a144e0194dead0532582 SHA-1: 3b73cf1c7abf5b550948d5f1e5a17ed1bd6f9716 SHA-256: 39c0edf46cba9e8c3f3434a1a2de5d5057139c3ad296b47428ffc228d1aef51e
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 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=best+anxiety+and+depression+workbooks PDF link annotation
    • https://tedetoxemerul.weebly.com/uploads/1/3/5/3/135311624/4a609541d6.pdfIn PDF document text
    • http://kprovk.xyz/wepogaxopemjgg75.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/10ea40a.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/cd69c4f3.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/gaxelos_miruzoduze_nekonem_rebaguxok.pdfIn PDF document text
    • http://grampus-shop.com/12_months_cash_flow_forecast_templatet30f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_600e710da555a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5fd7b172002f8.pdfIn PDF document text
    • http://bridgecommerce.com/hp_probook_6560b_batterymaulh.pdfIn PDF document text
    • https://femukigiterabe.weebly.com/uploads/1/3/2/7/132740239/699952.pdfIn PDF document text
    • http://azorocheat1.xyz/26164093089pfcli.pdfIn PDF document text
    • http://markettop.pro/cheat_engine_sas_4v4qzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_600100cf69f77.pdfIn PDF document text
    • http://shothard.site/zujefejazizuniwene2mhch.pdfIn PDF document text
    • http://xteenware.online/tecumseh_carburetor_troubleshooting_manuallby7r.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/ec36dcc5-cd04-4331-83b0-b90f05b73a15/3d_text_png_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec67fb42-fbb0-48de-aab8-0151da2e1252/what_age_is_stargirl_movie_appropriate_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e71b8d-3025-417f-b1b3-9c38f47ced47/the_history_of_sexuality_foucault_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc18e88-52c9-42fb-b1ad-3aa163295bfd/brandywine_auto_parts_bowie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369f5523-84d5-446f-a22e-14e00b6640d6/how_to_make_homemade_frozen_lemonade_concentrate.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_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 5436 bytes
SHA-256: 30f7d7b14e7ac6cf0b0941103132c23dc0394ce35ca28b3d2cb925ca0c1cadb8
font_01_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 11160 bytes
SHA-256: 4c270633fd2c4d2902df4d15ebc6a978572b8ccc5ac9a0ecb64528380ae9ea24

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