Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c82893acd23984…

MALICIOUS

PDF

101.3 KB Created: 2021-04-03 21:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b08d6f7b546bedf4f5dfa580ca30502e SHA-1: 1133e717fee1ed04d14ecb8f00b0a91b3cfa89b6 SHA-256: c6c82893acd239849fa8a9f674e992118f74bf293ee04c4ff667cb86c4757a58
186 Risk Score

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 0.9988

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://botokaw.ru/123?utm_term=ncert+biology+textbook+for+class+12 PDF link annotation
    • https://cdn.sqhk.co/koletexun/ghgcG1f/bokanazilasitigego.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/chff91R/aqa_gcse_business_studies_book_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_60100a62e1bff.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/OYaJhcG/first_day_of_spring_stardew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_604645dfcdaeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5fd7c1751ca8b.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/fZH04hc/58775538657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_6004f0ba1c158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5ff35b0d6470e.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/ihEwjew/the_impossible_quiz_book_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_604014ef72b3d.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://fedorahosted.org/lohitIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_aeda58b91d734d26a8ee6d69c8ae503e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/how_to_make_residual_income_uk.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_9eeb22eb5a274727aa58009cc2af1243.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/how_to_stop_architect_pop_ups.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_df4a609da4574b919084e5ad6e6f3519.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_7997f499af774723af383dc936247cfc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befafuni/16626919981.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/63916102563.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_ef8ddab7c1ae481ebb7d80276bec976c.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 5260 bytes
SHA-256: 11d79bf669bebbf9b4574c252e230001b51d76773999587ca7a89749c3a3474b
font_01_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 11592 bytes
SHA-256: 817bfef939b853d5d09365537c929aad58931edfc6e700e1f8645a3d9305434e
font_02_sfnt_off0001579d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579D 16096 bytes
SHA-256: b81bd6dad15da1d34caef1519340d18a34796ec70328335d7cf798cc40c487ae
font_03_sfnt_off00016c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_04_sfnt_off00017a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6B 3060 bytes
SHA-256: ffc3dedf7fc07b58965a3ed8aa86f30f29518db5a9a9c9621c6fb9bbfda83eb0