Malicious PDF — malware analysis report

Static analysis result for SHA-256 842740427d1fae22…

MALICIOUS

PDF

81.0 KB Created: 2021-03-31 21:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 677ec183b9f4f5cc10e9fa2e45347524 SHA-1: 5483f947f5bdd01c4e86cc82a8cf1378be3fffb9 SHA-256: 842740427d1fae2207df278e034dd2becec30169de120a8b13f5fac9a35d6e84
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 0.9992

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://xezojetit.ru/123?utm_term=attarintiki+daredi+serial+songs+free PDF link annotation
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/koxuvode-vaforozum-logazofowag.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/ja2lhg8/cute_animal_colouring_pages_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_6057fc165f902.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/kegagujam.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/kewip.pdfIn PDF document text
    • https://jenisevemib.weebly.com/uploads/1/3/1/0/131070602/8079955.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/eygePgj/7751417263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_600c73454e4e3.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/232a511fd6b00.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/82708595428.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/Kwiiic4/fibulesino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_601726735c9f0.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/blood_red_skies_advanced_rules.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/3-2_angles_formed_by_parallel_lines_and_transversals_lesson_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_605b8ea3ec17a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_ee65ef8e9c7c457399c161621bf05d3d.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_956734409b8e49b488d74998a18c7364.pdf?index=trueIn PDF document text
    • http://rikilusidarule.rf.gd/93466320983.pdfIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_1e5d66e2e3d7449ba25d8898de110f66.pdf?index=trueIn PDF document text
    • http://bogutofiwib.rf.gd/babasi.pdfIn PDF document text
    • http://nokezipaxizowox.epizy.com/tufetobezulaju.pdfIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_fb66d05110d74254ba59e85a47bfce77.pdf?index=trueIn PDF document text
    • http://dozokefonusabo.rf.gd/how_to_bluetooth_turtle_beach_px4.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_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 5128 bytes
SHA-256: 6656180c70a52ae84a1c46a5faa75d5bb71acf028e02e07efdf9c841daafa04f
font_01_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10616 bytes
SHA-256: 6085461a031f1cbca535041308edea0e2b15206b326378b0c2ec04cc6d091a83