Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b0eeaac0b6ca39…

MALICIOUS

PDF

71.1 KB Created: 2021-04-04 04:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 34525908a204d7410a21b363ce2f7cbd SHA-1: 14882cc962cba1fec4cfeceb63728c93b2612ae1 SHA-256: 85b0eeaac0b6ca3994dc4d144bab88792e8b35ab452859ceaf647d6dcdd48a49
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is the embedded links, likely leading to a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=mungkin+aku+tidaklah+sempurna+chord In PDF document text
    • https://dukifuti.weebly.com/uploads/1/3/1/4/131437117/dikemezasojolusiko.pdfIn PDF document text
    • https://gudabujazoz.weebly.com/uploads/1/3/0/7/130739385/masutumexa.pdfIn PDF document text
    • https://ponukikoruxa.weebly.com/uploads/1/3/4/3/134343798/49e84.pdfIn PDF document text
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/cb466414fecfe56.pdfIn PDF document text
    • https://sarudutedax.weebly.com/uploads/1/3/1/4/131453649/7755814.pdfIn PDF document text
    • http://vidoxojidovum.iblogger.org/19976319045.pdfIn PDF document text
    • https://gokodasev.weebly.com/uploads/1/3/5/3/135339924/429d0a0c4496.pdfIn PDF document text
    • http://contentmedialiteracy.com/can_you_be_married_to_multiple_sims_4ponep.pdfIn PDF document text
    • https://mokitapakajare.weebly.com/uploads/1/3/4/8/134885173/modogonoseri.pdfIn PDF document text
    • http://laxana.ru/crosman_760_pumpmaster_revieww8tbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/69359040797.pdfIn PDF document text
    • http://fajiwuwigekelal.epizy.com/bow_tie_pasta_recipes_vegetarian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33973afc-fe48-4080-8b47-96d1a8929d89/reasons_why_my_tablet_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd67cd2-0c03-4c58-97ff-4f59d46fabd4/dakebasenomedilawazaz.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/3442367797.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/rukajiluvubaniwide.pdfIn PDF document text
    • http://sotixavar.epizy.com/63696945186.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/85414156524.pdfIn PDF document text
    • http://felubefetixiwu.rf.gd/mole_concept_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/58488473198.pdfIn PDF document text
    • http://joxugodeluda.rf.gd/3588026942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed4277f-283e-44b0-9ea9-272886b89112/how_to_turn_on_proform_bike.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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 5556 bytes
SHA-256: e03109b4d9ac30aa24da63ba7ce6a0e22479c760a2e4d5df7e2343b5360dbef0
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10272 bytes
SHA-256: 237e5f0587ee11f67c8ddc2e9c195048620a076838930af873600210d3460b5d

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