Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c5ab5b56943d44…

MALICIOUS

PDF

66.4 KB Created: 2021-03-15 09:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d3a9a8d3ba28d2298ba8ea87abd94d86 SHA-1: 9927f72c63965f0730d65bfbe715d9a561080c5c SHA-256: 99c5ab5b56943d44332bc92ffd8d134cc6cb3466dd11b00de3d58152ccdf6767
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 0.9998

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://dafemum.ru/wix?keyword=esp+module+5+chapter+1+quiz+answers PDF link annotation
    • https://cdn.sqhk.co/tavikebepo/6ieOijV/2692678483.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/iTrFWjf/zexegejamigetivutudajav.pdfIn PDF document text
    • https://cdn.sqhk.co/nujorazaje/LBjjhgd/larusagubetina.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/uhjVBys/word_search_puzzle_creator.pdfIn PDF document text
    • https://wixotofipexux.weebly.com/uploads/1/3/5/4/135400714/941d85f763ed.pdfIn PDF document text
    • https://pilorixo.weebly.com/uploads/1/3/4/6/134689004/8457514066054dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_1c82e718605046898d71cdd36ddb8117.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/xowexabatonakixelipos.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_5f5bc4605a144bf48e75307adb2de950.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_82980c6610bc488dbfd6271af99319b3.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_154524d264b94e9db1565e9031492755.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_0f6ab95025ed4b0b91f84c44d4cba24f.pdf?index=trueIn PDF document text
    • http://mitofozajibo.rf.gd/wejasimitojejipunuguja.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_d1e4232c31eb4b5e86a9f9c133af5b69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/figurative_language_examples_sentences_simile.pdfIn PDF document text
    • http://vopapatadape.epizy.com/66574786331.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_0989aa6a5bb74cf5a84019cf306719b9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E1 5716 bytes
SHA-256: ebf311d3b89200efdade0b3a93b51a9d21c9e46b63b32f9170a8638ecc4ee37c
font_01_sfnt_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 10304 bytes
SHA-256: b6dd3936a7374c1b68d626580eeb59c4cfc57c0cfbafd1653d852f497d64c30a

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