Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0be89bcc18268c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-13 22:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 35dd12e404ad47f6e989859dd9381b77 SHA-1: f75a94794c03799413be60690ca8b8af314b2ab2 SHA-256: 3a0be89bcc18268c62aaa996b3f10830eeb922e544c689c7eb6fed51fabaca96
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'antonyms worksheets 5th grade', indicating a social engineering attempt to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=antonyms+worksheets+5th+grade PDF link annotation
    • http://c-advance.space/570656221025ycor.pdfIn PDF document text
    • http://tesocoin.online/algo_trading_python_libraryhnk83.pdfIn PDF document text
    • http://drnextact.xyz/numark_mixdeck_expressp1b6k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_600ccc54cc7b8.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/87237424322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6021aab2109cb.pdfIn PDF document text
    • http://banquepopulaire-fr.org/dirt_devil_featherlite_cyclonic_upright_vacuum_manualsi0cs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_6040085a9649d.pdfIn PDF document text
    • http://jadebey-x.com/vibiladalaxuxol5g8vn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_e2ee10850498456a8eb8cb0131e0a54b.pdf?index=trueIn PDF document text
    • http://vatifijagix.epizy.com/46632333621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee004008-7b36-4f5f-a8cc-c2fd5e998ef0/71627820660.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/1978_honda_express_moped_parts.pdfIn PDF document text
    • http://gonoluripep.rf.gd/dejakefekutumixoze.pdfIn PDF document text
    • http://wetafemef.epizy.com/maintenance_technician_cv_template.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_792533e32f0145cc822313a98953fb90.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_de9e10ec64f64af29e51a61e36e0a87a.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_235936effb764ae58541fff7fdb4b4ab.pdf?index=trueIn PDF document text
    • http://dudakesiburegig.rf.gd/weed_eater_lawn_mower_carburetor_springs.pdfIn PDF document text
    • http://wivifizurata.epizy.com/namobopovokifimeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e3e58e-bfba-46ab-943b-a3ecda83e0ae/22971285972.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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5576 bytes
SHA-256: ca2c1dc2af4149f0be23be3b2d596bf7d67449c940bfcb30643e4cc886654bd0
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 11472 bytes
SHA-256: bd8235d9e7cbb3ba536645c36489f987a548caba7047ece6de3457f2332a6b63

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