Malicious PDF — malware analysis report

Static analysis result for SHA-256 9756a93b90fb3a48…

MALICIOUS

PDF

73.8 KB Created: 2021-05-09 08:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cbeb9cac6c404c77f0a7927075814dd6 SHA-1: 26b7a5485ef2d73f3e1805950d8c150682304c5d SHA-256: 9756a93b90fb3a48d06c122edb39be1e6f44773a6be5222d822b87b67f597947
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=do+ez+go+golf+carts+have+titles PDF link annotation
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/nifakoji_piwaxuzesufo_nanepive.pdfIn PDF document text
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/wubodiwav.pdfIn PDF document text
    • https://nelinijamewugin.weebly.com/uploads/1/3/1/0/131070382/4897da2ea2d3ae.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/552b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_211d8790f5b14fb280fa714a3df80a8e.pdf?index=trueIn PDF document text
    • http://tixololug.epizy.com/28218353343.pdfIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_c9774279feef4acab3f3ac18d1bf7f8a.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_ffa0edbe16d1415b985989d2578ff605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/gajozegafefozugome.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_a215a119f62040b3970ed244da31503e.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_b66dc826849244d780abfcde7cbd90a4.pdf?index=trueIn PDF document text
    • http://gapedazawa.rf.gd/78932998441.pdfIn PDF document text
    • http://tujulerika.epizy.com/julasazevesenabero.pdfIn PDF document text
    • http://bituwevemexeku.rf.gd/jotamofetuwuvojivuza.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_7242cab1469d4cf0955a7b9865583ddb.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_98b1cdd273684e67b51ecab202b666ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/kokuva.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_9e17e7f6ac264f399104781b8dd621bf.pdf?index=trueIn PDF document text
    • http://bowedaliwerox.rf.gd/risk_godstorm_rules.pdfIn PDF document text
    • http://sepevelozexim.epizy.com/27819377383.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_42119022b6954522b85ef9fc296c7376.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/gapabewepi.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_9b35d6cfd5884637bb8e7489669f3248.pdf?index=trueIn PDF document text
    • http://ferugasa.epizy.com/gimenisosuval.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 5252 bytes
SHA-256: 9b7317ce8d750b10635101a4dbd9979726a9bcf1cee2f40d1aeff2dfe4403d5d
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 10232 bytes
SHA-256: 78d9ac6e8a36067817d119b5b45e18d8150f0bcc51e85f427ba8ffe5d8aff558