Malicious PDF — malware analysis report

Static analysis result for SHA-256 620a61522ff23853…

MALICIOUS

PDF

78.6 KB Created: 2021-05-10 21:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb14f303d4c84ce0dc98c32ae14378b5 SHA-1: 21e45662f9f5b10e151721d50a951c973d8dfce1 SHA-256: 620a61522ff238530bd3fe9c50c4c8a4055207c1ddd21fa61b9f05905314a159
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious redirection, likely to phishing sites or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=origami+heart+with+construction+paper
    • https://cdn.sqhk.co/vukixukafoga/jfjhLTZ/4897254629.pdf
    • https://zageporipemaza.weebly.com/uploads/1/3/4/5/134507549/guzazofib.pdf
    • http://sneakerspapa.store/yamaha_dgx_650_manuale_italianoys6e9.pdf
    • http://helen-art.ru/kenmore_he3_washer_pump_replacementg4wv4.pdf
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/5619215.pdf
    • https://cdn.sqhk.co/zukuxenopo/ijhTXva/vulepewowamaxiva.pdf
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/f9d584c1359fa.pdf
    • http://vitalia-transports.com/23164381905urksp.pdf
    • http://salet.store/720480905378ec5z.pdf
    • https://cdn.sqhk.co/pegipoveridi/jgeQLSN/rokekojunavo.pdf
    • https://cdn.sqhk.co/kinifukix/6Szhjji/disney_premier_visa.pdf
    • http://lifeshop.pro/73075264851yxkuq.pdf
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/15cab43e2f5ba60.pdf
    • http://new-volosi.ru/13373892794hv1jl.pdf
    • https://cdn.sqhk.co/xuluriwu/cm7AxUW/bezekodugajotiw.pdf
    • https://faporipito.weebly.com/uploads/1/3/4/6/134600592/mopupob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_c059a88f2c424f84b9ae275740ef9f59.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4f7f9243-cd4b-4e2d-a420-9d0fb3bceffa/96627095975.pdf
    • https://uploads.strikinglycdn.com/files/1e2976fb-b710-4af8-8f16-217755b716bf/how_to_make_playdough_diy_slime.pdf
    • https://uploads.strikinglycdn.com/files/8af2d8b9-07d2-44f2-99d2-cf97c9be8506/4887758638.pdf
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_44b4aebe693643cca6f45b200722e4f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6529fb6-7772-4404-89af-2db45f54cb87/tivomitivonomaxuno.pdf
    • https://uploads.strikinglycdn.com/files/835dd9de-5384-47ea-a9ca-0c26cf29e6e3/6694241530.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_b7183093a8e04e7db91128284e604e93.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53a.bin
da52282bbcbe1eab25b47f3989948b579fb0cbc2ed8b8ac87a736dfd519c9789
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5432 bytes
font_01_sfnt_off0001079f.bin
b17578cef7556e8ec76a7f1fcaad768dfd496342e31833fdeb4715939dca90c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 10924 bytes