Malicious PDF — malware analysis report

Static analysis result for SHA-256 e257cadaa0e069cd…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 02:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0b38f5f9b65a6d5a1a4662eecf41cd9f SHA-1: 64b9c72d242f01de407c8c1a6688d22f00961627 SHA-256: e257cadaa0e069cdc5edbd0560ea070ce4bdda329e8611695bc8f5ac5fec4aa2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to search queries.

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://xajibur.ru/strik?utm_term=what+does+a+septic+tank+drain+field+look+like PDF link annotation
    • https://cdn.sqhk.co/fekesolip/pgdidOx/lonaxarerew.pdfIn PDF document text
    • http://pagebake.com/jowudomegepulejatebabavoz7gg8k.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/28373636185.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/bcCDYix/adidas_street_basketball_shoes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5fda8d98d6242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_6025eab0642f8.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/j8he8if/cancel_my_simple_mobile_account.pdfIn PDF document text
    • https://somigoduwus.weebly.com/uploads/1/3/4/4/134470899/birelaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5fc9a62185b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479921/normal_5fd2930731ef0.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/1868246.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/hajdEic/40162459232.pdfIn PDF document text
    • http://fullhp.info/mokinojlacbz.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/toefl_pbt_sample_test_with_answers.pdfIn PDF document text
    • https://gozobamo.weebly.com/uploads/1/3/4/7/134714837/wejesis_jupidosis_vopibujuvi_dikunerawowekev.pdfIn PDF document text
    • https://cdn.sqhk.co/xewebevij/lhEXkpW/voguxakegataz.pdfIn PDF document text
    • https://vekeliludodim.weebly.com/uploads/1/3/4/7/134745250/neteredafode-kiguporew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_ad28cd1a54ad4065bfb46700c4dea9c1.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_ecf390a87fca489c8afdef310fb45321.pdf?index=trueIn PDF document text
    • http://jumepenitujox.atwebpages.com/38846786852.pdfIn PDF document text
    • http://laxukumelukadut.myartsonline.com/20270136926.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_47fedeb567a84970a8eb22dce8c1f444.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_73061d3e27e7420998afd45451fff13f.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_ce4912a9c8b54d08851c8adf32454a2c.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_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 5320 bytes
SHA-256: 25eaf9ec31e515846f9711c7245c8342b114cca353aa8f3902fbe88c7c58485d
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 11012 bytes
SHA-256: 6cc8df78d75ff043ed39cedf38965d65c02823c9db0373b948ae70dc9270084e