Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4a6183cbab58dc…

MALICIOUS

PDF

80.0 KB Created: 2021-04-14 01:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0282ef7e27f31099f48498eff46f61ef SHA-1: e0e922e67d497f66a732ff5722ae65c68c4c47e1 SHA-256: 6b4a6183cbab58dc62a79d91a5190dd409444cef115c4fd52a85da7d062b1231
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, and contains a significant number of external links, many hosted on disposable domains. The document body, though partially corrupted, suggests a lure related to "how to remember a speech" which is likely a pretext to drive traffic to a link farm. No scripts were extracted, but the presence of numerous external URLs indicates a phishing or traffic-generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=how+to+remember+a+speech PDF link annotation
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/5161a.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/ad48a87b.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/disusej_suzilofenajit.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/9757424.pdfIn PDF document text
    • https://lufetanajimub.weebly.com/uploads/1/3/4/5/134592974/zapulugef.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/b6832a9d037.pdfIn PDF document text
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/648bc85893ebb4b.pdfIn PDF document text
    • https://vosaxiwajikox.weebly.com/uploads/1/3/0/9/130969878/f7ec2f.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/2663733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugelow.rf.gd/how_do_i_set_the_date_on_my_armitron_pro_sport_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/bakukawasujoru.pdfIn PDF document text
    • http://fasasipapuzu.rf.gd/sociological_theory_of_law.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_ec3736fc2e08400c9a94d92bee25dacf.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_fdaa592a1fa2417c9c4254b2c0680e46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/fisalip.pdfIn PDF document text
    • http://lixanixuzuki.rf.gd/nobigofotetifugeloxozim.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_b7fe61f9162d4ae4a2f23614c279e1b1.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_f1bf190064dd475bb5fad4ccfa9e2798.pdf?index=trueIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_0af24eb262784f4eab9919baa8806d35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/zagg_ipad_mini_4_case_with_keyboard.pdfIn PDF document text
    • http://rovalonawu.epizy.com/33953528529.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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 5332 bytes
SHA-256: ae2e7c6194c3133febf64e0f2b405534bedb8e4b3811f63eaa645080f6925c04
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 11184 bytes
SHA-256: 57ade5fbac059e7545d744c1ebd06e394e164b0166ef629dee3808fe6c7da16e