Malicious PDF — malware analysis report

Static analysis result for SHA-256 03612907ba674d2d…

MALICIOUS

PDF

79.0 KB Created: 2021-02-27 20:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2dd1468c96b0998672d9d8201ce7cc2c SHA-1: 8b04a54c0c6138ef86e711deee1fe2d2ae4c4b90 SHA-256: 03612907ba674d2d6a2c51c452c7fee5247b8e85fcd4365e4ee1035941920647
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to dryer repair, likely to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=how+to+install+belt+on+maytag+neptune+dryer PDF link annotation
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/lebux_liwiluditutemof.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/jhiaOYo/12329258826.pdfIn PDF document text
    • https://zomudefe.weebly.com/uploads/1/3/0/7/130740133/negoxu-tajovusarebizi.pdfIn PDF document text
    • http://copyright-notice-ig.com/8004711604ut153.pdfIn PDF document text
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/2786256.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/l6heoih/33816797465.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/gdajiiy/fabodinujasarokex.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/9351358.pdfIn PDF document text
    • http://vashastrahovka24.ru/gameshark_tm_codes_emeraldqw7fe.pdfIn PDF document text
    • https://pakupefo.weebly.com/uploads/1/3/0/7/130776676/devagimod.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/85761b.pdfIn PDF document text
    • https://zuwejuropuri.weebly.com/uploads/1/3/1/6/131606208/winumo_teregojadebuvav.pdfIn PDF document text
    • http://wellwork.site/composition_of_functions_worksheet_rpdp_answerszbei5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xelimewat/cortana_app_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/43996340078.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/33373559159.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/mulshi_pattern_ararara_song_free.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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 5572 bytes
SHA-256: 5e5e21a3ab0b74d29feaddb69709cd06ccf0ec10177c8c03c2f7abf9591cb4c2
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 11352 bytes
SHA-256: db70f858b4e8d46fdc5a8b735716ea71f909ee6e3d8bcdc80841b67660a4b6ad

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