Malicious PDF — malware analysis report

Static analysis result for SHA-256 587b2fe259620e38…

MALICIOUS

PDF

73.1 KB Created: 2021-04-12 20:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78caaac9bd7d734da5d5e442d470ebed SHA-1: 28a220d263f5e3571da40d3c61879e1ac630ab1b SHA-256: 587b2fe259620e388f293e56263396b71e2b0eca262eea8662a7e395fcd55ac4
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=air+hogs+thunder+trax+charger+cord PDF link annotation
    • https://potomifor.weebly.com/uploads/1/3/4/3/134332951/5663380.pdfIn PDF document text
    • https://cdn.sqhk.co/fexonawizoz/hhaidXC/16916619459.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/soxafemiragularinif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fc68a0dd489b.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/0Ogizji/30062222967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372072/normal_6004d4e378e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_603c273208c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_6025923bd43ff.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/bopafovub-pavapowudogoke-linuzewuzafidiz-lojogexagarexoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6011f5ff50a44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_b7b564bee9f34143b1b36b526bc2844a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f78e019-eec9-4dcf-96c3-d58a177f57fd/gunajigezigujejalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fe9666-0096-44d6-a49e-7f3e49ef6c28/84690298507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b35869f-1986-4fac-864e-8aa290672bc3/matonedudeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d76c699-a2f0-4216-a9e6-409e4b7e087c/jatefuvijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338ad9b9-b59d-4eaf-b767-b6416f02ca62/vedodomeref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a678f044-01be-498a-bd6b-815adc5dd168/does_walmart_sell_tracfone_minutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f6e511-80d1-44ff-a236-1880d211c49f/fifty_shades_darker_quotes_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af8ce3d-cf6c-4d10-8f48-9202fb0a8563/what_does_c_mean_on_norcold_fridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d43b87-91c5-44ba-98bb-437d3aeaee8f/50750464917.pdfIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_ba58ecca56d04715bef0cdc78bd08dc6.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_a9b2293709d34b44b19178aa002d16e2.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_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 5228 bytes
SHA-256: 03c6679460c34c233662b5f487dcb637f286956d4f524f628dd3cca0e0de7938
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 11168 bytes
SHA-256: 06a435d608ed55d8ca67cd8661b62828ee928296c87be62ada43745e05343c7f