Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde12d4f166282ae…

MALICIOUS

PDF

74.6 KB Created: 2021-04-28 22:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8ed937c31a1a5c1948f9fd6434ca1624 SHA-1: 74790b5e27545e937f429711af1ea48471e3715f SHA-256: fde12d4f166282ae8c866a426565d28ee66438c5c0e10d0eb612270387fcd67d
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gimoguvi.ru/strik?utm_term=cuanto+es+5+mililitros+en+onzas PDF link annotation
    • http://lotukaguw.sportsontheweb.net/67481990183.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/oxford_practice_grammar_with_answers._advanced.pdfIn PDF document text
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/menow-nadojiwole-fores.pdfIn PDF document text
    • https://nipituwosaxow.weebly.com/uploads/1/3/5/3/135312928/0ca8bc690aae8a1.pdfIn PDF document text
    • http://creditstar-kabinet.com/notewuz22yfg.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/jViguie/block_puzzle_new_1010.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/jnM8chg/xapaje.pdfIn PDF document text
    • http://13millions-warzone.store/13742820424phql8.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/dinevovolowerumaxonoziti.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/Rhcja3y/57334088615.pdfIn PDF document text
    • http://es50off.pro/what_is_computer_parts_meaningzorkr.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/14916105563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_022b1472efb44c2fb486ae386b2077c1.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_18369a0edccf4c04af73e292e8175ffb.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_2a808540406c4aedbaac99ed9a783367.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_080ba555aecf43c69313bd1dfd4eef30.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_04d27d520afa4fc08e56af5cde6a97ca.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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 4912 bytes
SHA-256: 7f617b862df7bd5394442baea90c36215a5f5075bd3718b86745f61b4c469b8e
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 12216 bytes
SHA-256: 8b2d7792432635385d2347017e50f9795095fb0b8bca1e998a39fec6b6b0eecf

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