Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef123bded2ae66b…

MALICIOUS

PDF

78.3 KB Created: 2021-04-23 18:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f803f4db924e84f941fac02ba0ad94c1 SHA-1: 286132ff52f49758d1b41f4a6bd2d38b8c4b3f98 SHA-256: 7ef123bded2ae66bdaa5d4e2fb37f65a0dc9fd66cc67c4c4a417d61e3928d620
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary URLs is `https://golowaki.ru/strik?utm_term=black+bourgeoisie+summary`. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=black+bourgeoisie+summary PDF link annotation
    • https://boxenujanazikof.weebly.com/uploads/1/3/5/3/135302290/693223fb36cccf5.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/28497788028.pdfIn PDF document text
    • https://gomujivas.weebly.com/uploads/1/3/5/3/135321586/90a0f829.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/puxipez.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/deziroxap-minajiw-pikudadalunuko-kerorurepufer.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/how_to_connect_logitech_k400_plus_wireless_keyboard_to_samsung_smart_tv.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/construction_company_profile_malaysia.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/8560269078.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/arcadia_quest_beyond_the_grave_campaign_book.pdfIn PDF document text
    • http://geforiro.scienceontheweb.net/the_scarlet_pimpernel_by_baroness_orczy.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/rusututivuguze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_718950b4586747d2a3c24699258f9d32.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_905a657829d047b6bb2e4aaa139c5acf.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_b76fb04be6a34ca2ba25a253036694a9.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_a25f960eabd34631940983cf2cf72d48.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_3e3bdb3eaa4444ac8378c247b6b5304d.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_3a1df43d636a4c54918341d970464b47.pdf?index=trueIn PDF document text
    • http://telifujovemevo.atwebpages.com/97327787151.pdfIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_e3e62375e70d433686b0a5e4cb5d61f1.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_5f332b97738845e993b36664571f17a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokudapele/xaloxufuvapokoluta.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/verizon_router_settings_for_gaming_2020.pdfIn PDF document text
    • https://01c36edd-4624-43d2-a45c-450d276cddbf.filesusr.com/ugd/f34823_aec42e608cee4451b7d6d3fe424a9bce.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_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 5476 bytes
SHA-256: 10176735e3a4978e5c6406f489f48d1f0f6b91be8342863f8ef2f8543c776575
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 10784 bytes
SHA-256: 286d30b573ff68c0822b0e4ea992309485147426bdab9181fa59ff34e7514220

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