Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6f47c5349c848b…

MALICIOUS

PDF

79.5 KB Created: 2021-03-27 23:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e2bd27cdc6384a329fe8580d7839dc2e SHA-1: 0829a19219aa9b7cf815f01880f670226da45913 SHA-256: 4b6f47c5349c848b820a4086d8b601b5ec6075de8653507b6f4791e9cbd0e1ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://golowaki.ru/award?keyword=administration+office+365+pdf PDF link annotation
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/153bb3a5a.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/cgdgiEq/84720916837.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/giic5gd/8654469667.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/nebijit-momuxagif.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/46052514546.pdfIn PDF document text
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/rewolomebam.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/locomotion_in_amoeba.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/jusijagawig.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/39874550463.pdfIn PDF document text
    • http://situvupumu.medianewsonline.com/sql_interview_questions_for_experienced_professionals.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/zixununewamenik.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/emperor_jones_records.pdfIn PDF document text
    • http://podemufibe.iblogger.org/99730844495.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/5tjcmSU/retrograde_motion_definition.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/dolipek.pdfIn PDF document text
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/a3c5afc.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/devewezuf.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/hije6if/24874690125.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/ignjayP/jikotop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafazemebotege.rf.gd/38685538212.pdfIn PDF document text
    • http://neropalumej.rf.gd/free_greenhouse_building_plans.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/58494310984.pdfIn PDF document text
    • http://jutesokom.rf.gd/62008721742.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/jejoduxe.pdfIn PDF document text
    • http://junumibovu.rf.gd/sony_android_tv_or_samsung_smart_tv.pdfIn PDF document text
    • http://rejosunugewojif.epizy.com/19085425804.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_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 5700 bytes
SHA-256: ec57f588667661605b9cc5f9dc9a952c5063deeb5ab4bef66772ab392b71c58d
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 10896 bytes
SHA-256: 057b2e0b622834f41038287b18c0072ec5890b7d9a6b504e5245be1f7de3b6fc

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