Malicious PDF — malware analysis report

Static analysis result for SHA-256 a913494b08ce339b…

MALICIOUS

PDF

81.9 KB Created: 2021-04-09 11:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d3efa4db741ad7e8280f0dc710289a81 SHA-1: 9d728ca8ab54fb78980b5ab6b237693066fdded7 SHA-256: a913494b08ce339bbca523b43b8950d20787fe63e5edc8480cea0c9a9cd0a1cb
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 domains, suggesting a link farm or phishing operation. The embedded URLs likely serve as lures to redirect users to malicious sites.

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://botokaw.ru/strik?utm_term=what+is+the+importance+of+technical+writing+in+the+society PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5ffe121d84d2e.pdfIn PDF document text
    • http://allwoman.site/gujofekuxidowogixuduguh.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/9177741.pdfIn PDF document text
    • https://jinidodax.weebly.com/uploads/1/3/0/9/130969434/e5f8678d472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fcbb3e061f4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_6003254e666cf.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/5633098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_602de258f04ec.pdfIn PDF document text
    • http://stopro.store/howls_moving_castle_netflixs377v.pdfIn PDF document text
    • http://kalulib.iblogger.org/92826273224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_5fe8765fe4cc4.pdfIn PDF document text
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/1968053.pdfIn PDF document text
    • http://help-copyrighteamservice.com/32526725963tww8c.pdfIn PDF document text
    • http://lotto-investclub.com/rodojopox46jk.pdfIn PDF document text
    • http://thedefenseforge.com/how_to_tie_a_toga_over_both_shouldersnd0xg.pdfIn PDF document text
    • http://salea.site/what_method_does_philosophy_of_nature_adoptj5784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zobovobewuw.epizy.com/68716621131.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_cd9e318be9354391a42802f2ce908b5e.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_96b6d428c27549289bb8ae7d37a7bd2f.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_d1b4d72563ca408e9e7285a309fbc9df.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_c43e8621251849e595b3f6f64edca587.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_a0676b52636e408faf409f294bae16bb.pdf?index=trueIn PDF document text
    • http://fafezevasuba.rf.gd/fexemopuwina.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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5424 bytes
SHA-256: ad9008970da28f44889ec28d5fe23d7e01d313f5baa5fe53917ce5cfa842951f
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 10620 bytes
SHA-256: 3281721ed3275aafc4be1617525146b4491e5639630b2d18c99fcfa59b54ff96
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34