Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee98807871ed5b60…

MALICIOUS

PDF

86.2 KB Created: 2021-03-29 21:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2979fd5e6f3ad89bf875d65fa138aca6 SHA-1: 8750465703de9a61db7b36be0ca6297e58aeb63d SHA-256: ee98807871ed5b608efa5abe28fff332c65df3499a9d39566683007e658477cf
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-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://xajibur.ru/wix?keyword=spanish+greetings+and+goodbyes+worksheets PDF link annotation
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/8039420.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/oedipus_the_king_lesson_plans.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/metixog-nuvelevogovez-wovazugero.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/how_to_wire_a_micro_usb.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/14381143676.pdfIn PDF document text
    • http://strongcreditscore.info/kojunetoruvuworapofeb24w90.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/33982357750.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/tukipuv_nepituzobive.pdfIn PDF document text
    • http://iuts.space/commercial_cool_deep_freezerzs01z.pdfIn PDF document text
    • https://vefoduwuwi.weebly.com/uploads/1/3/4/9/134902927/pupalax.pdfIn PDF document text
    • http://swiss-family.space/buzogizur205s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_9c38bc2b1ff14828a29b0a18d4b713e2.pdf?index=trueIn PDF document text
    • http://zorufuzelal.rf.gd/39903739560.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/french_to_english_textbook.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/bowuxawujijagowebunisuro.pdfIn PDF document text
    • http://sotemapepuko.epizy.com/glucose_tolerance_test_diet_sheet.pdfIn PDF document text
    • http://sulenovigadi.myartsonline.com/compound_verbs.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_5065c8dd0936488589a517deac21020b.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_7e79017ac38d442f958df948fbbf3737.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 5688 bytes
SHA-256: 29fb07b2a89b56080336cc1d97edea37be9890d0cc325421ede16583471715b5
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 12188 bytes
SHA-256: 85c37eb2409a8440015b774bb46d09b0ddcd68fdad4d00bcb1283f6f8914c15d
font_02_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 17660 bytes
SHA-256: 881126320ea04c2eaea05ef6e4b500007eef3914f25984c447bd6a71dca434e0

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