Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef60a368496588c…

MALICIOUS

PDF

103.4 KB Created: 2021-05-09 14:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa52ee50fa5193da04f5c639a757f203 SHA-1: 83ca936e0ccf853c103a2a093f728d4f47028042 SHA-256: 8ef60a368496588c26be82f661bb015fa837625960023cc3dab1ee3346fac8a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=english+second+language+lessons+online+free PDF link annotation
    • https://cdn.sqhk.co/fapetemiji/eDuhgha/88247520551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412900/normal_5ffa2e0aa813e.pdfIn PDF document text
    • https://cdn.sqhk.co/jutepoxof/f0geXea/real_bike_racing_free_download_mod_apk.pdfIn PDF document text
    • http://zupiworifokovaw.22web.org/39995275889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_6047c15ed2a0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_600876689136f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388818/normal_5ff80473f10f8.pdfIn PDF document text
    • http://zakunofukar.iblogger.org/bakoxozobodumado.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/6jhjdSD/clash_of_legendary_titans_gold.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_603ed5587cadd.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/jhdjjie/34372753573.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/eKPTMea/download_game_gun_strike_elite_killer_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_5cccbf7186a240298f4dd4624e0daa37.pdf?index=trueIn PDF document text
    • http://boragilaz.rf.gd/rofifidatewux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f064f76-6202-4b81-a8a3-0cd72899dfac/bimonekokap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d90fb8-47fc-4ff2-a52a-2a040b228a71/masterpiece_frank_millers_the_dark_knight_returns_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a349df-73ae-449d-81c7-96046a04411f/spring_framework_reference_documentation_5.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1076cdb4-e728-41b4-b4bf-33597e696635/the_wicked_king_holly_black_series.pdfIn PDF document text
    • http://besarod.rf.gd/sejez.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/kadovemutatixupakevej.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/gazesizazoz.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_b4ea479a376d47bd948f14e8ebb113f4.pdf?index=trueIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_16d4fb7d66d64728a650666526d33c8d.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_off00015707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15707 5240 bytes
SHA-256: 088946453503eebf3610236bcf9c92aa52ccd134f3610a4dd4d35eeea3d30c9f
font_01_sfnt_off000168d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D9 11412 bytes
SHA-256: 7857d9c7623695a0c7165052e6075e3453eb6e5206a9aba12debd540e5919b8e

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