Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37e1f0650e66abb…

MALICIOUS

PDF

97.1 KB Created: 2021-04-28 05:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e8355f9190d263caf52fd6bfc5a8691 SHA-1: ecc7b721f0baeb71d5d90d1811fcebfa83994bc3 SHA-256: e37e1f0650e66abbac016c3d8f9ce375d8ede9a450c2b145290c97010bba4005
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=tiny+house+builders+in+canada PDF link annotation
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/bemidotegeborobi.pdfIn PDF document text
    • https://ketawajizaw.weebly.com/uploads/1/3/4/5/134528489/3012346.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/05d7ba6a01855.pdfIn PDF document text
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/5805525.pdfIn PDF document text
    • https://pipumemudif.weebly.com/uploads/1/3/4/8/134866913/batoniz.pdfIn PDF document text
    • https://kugasesilij.weebly.com/uploads/1/3/4/7/134702015/gosirufobadav-javurefugoganuv-zanaxifibowero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_65d94c601b52409b887de3d5e587ca11.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_4b9e8ddb052c478490773c2f901032b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/why_is_the_wireless_light_blinking_on_my_hp_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb13da4-57e2-41fc-b971-b2309eb5ae61/6106042321.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/buraletejesupodumajepebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84576ef2-44c5-4d25-8383-e984cb9f53f3/65146940725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430fc172-b4fd-44c3-a597-9ff006cdf192/fugujaveb.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_e2634019409c4c298df0f0aa8ceb32df.pdf?index=trueIn PDF document text
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_cc59478430ae4cbab85bed69be8d4f7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/25452706138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e009e3-68dc-4286-8661-194a94651fbf/seventh_grade_7th_grade_language_arts_worksheets_with_answers.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_d84f43d68f504559a683e8c189660079.pdf?index=trueIn PDF document text
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_cce36b6242464a0ebcb6dcc2966d1569.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/vigor_2952_datasheet.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_42b76e71927b485e8da71450ad121a73.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_off00013dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFB 5216 bytes
SHA-256: 7ffe8e4ac2726cfec0d823075316a7dc1e8ec3d2e95fdd9eb5ef7ae9ad4832b5
font_01_sfnt_off00014fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB2 11400 bytes
SHA-256: 5b8b8b37986e18c57117af46b478c650bfd3424c7e9798b68e1b96327ae7bce8