Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afc007cf73381b7…

MALICIOUS

PDF

80.1 KB Created: 2021-05-01 15:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f90aabaa75c095d418749b8572a23200 SHA-1: 3020627bdaeee9b62e06caa73256722f9ca64c4c SHA-256: 9afc007cf73381b7804b929de897e1e3eff755edf5342b9ef593419d0a151cf1
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. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, zajinet.ru, is associated with a 'strik' parameter, indicating a potential redirection or tracking mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution via link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=norman+nise+control+systems+engineering+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392659/normal_602e75c610ebb.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/marusevila_kikoxeliser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5fd676e9f2029.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/ifigKqL/govokow.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/ighgjhh/challenges_to_human_life_on_mars.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/3c6e9cfa.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/435638.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/he0bkgj/98080395236.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/3iflUGc/27134711294.pdfIn PDF document text
    • http://nujosanoze.iblogger.org/foduvikonexovubuwavufizeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60273af6ed70d.pdfIn PDF document text
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/dobodajag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d3edb6-f41c-4042-ab4a-07a478510de2/54569263908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9858c9-6966-4de0-99ff-5b6ea3127138/sunbeam_sm0701a7e_microwave_oven_manual.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_3cdde7228ff941169e694af72fdb3e58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4d4591-3477-4db3-b57b-f7e9e8e2a384/essential_oils_desk_reference_3rd_edition_hardcover.pdfIn PDF document text
    • http://giduzorim.epizy.com/stryer_biochemistry_free.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_04301aa5100b4040a09fc753a8fd21ef.pdf?index=trueIn PDF document text
    • http://woxomog.rf.gd/unknown_facts_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b17806-b281-4e52-a0ed-00d23de5984c/how_to_reset_bose_remote_control.pdfIn PDF document text
    • http://nodobaviravi.epizy.com/sewakuxerokafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1759ec14-f528-47d2-94d2-85582377e69f/quiero_tener_cunados_que_no_me_cae_mal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 3392 bytes
SHA-256: 0e701224606bcdb61442bbd5e6877e6d55a3f104444b69f180c69f9475ce9a57
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 5544 bytes
SHA-256: a098d92e2e32cd857bb7a615fda765dad48287356145645039616122b01a4996
font_02_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10588 bytes
SHA-256: 37da025c65fba783b6198186740f347b77bb93a9e0daffed7709d407f119f9d6

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