Malicious PDF — malware analysis report

Static analysis result for SHA-256 144e42a9ee18f99f…

MALICIOUS

PDF

80.0 KB Created: 2021-02-24 13:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 167d01b17647616ebd2c3e9b4e98c393 SHA-1: 25b2d419d78c36b9e4f0bab50033667cbd3bb0d0 SHA-256: 144e42a9ee18f99fd27a136ed81732a0542dc6f20294206719cda9ed364be27e
126 Risk Score

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to a 'Generac 5000 watt portable generator manual', suggesting a lure to trick users into downloading a payload. The presence of multiple external URIs, including those on disposable hosting, further supports a phishing or scam attack pattern. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=generac+5000+watt+portable+generator+manual PDF link annotation
    • https://cdn.sqhk.co/farukisinu/37hghby/stampy_s_lovely_world_download_minecraft_pe.pdfIn PDF document text
    • http://creamwalls.space/oxford_modern_english_grammarh0z1e.pdfIn PDF document text
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/4687493.pdfIn PDF document text
    • http://xeeewq.xyz/boy_scout_book_202099pzz.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/8a91d6c81ec96c.pdfIn PDF document text
    • http://yoga-fitness.space/21582932201yskp4.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/f5ygiif/dopobojopenu.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/22iihac/quick_duck_shooting_range.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/zidosozawok/44281915565.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/befijopowad.pdfIn PDF document text
    • http://mapesag.epizy.com/nifapurawuromirabuge.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/97565960606.pdfIn PDF document text
    • http://figejadinopi.rf.gd/37854074219.pdfIn PDF document text
    • http://kexobub.rf.gd/xejopomunekezamaveduwino.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_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 5604 bytes
SHA-256: 174af15568f17795c806c7a93108173dccdf72f57dcb9bfc714b95e381d59bd5
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 11292 bytes
SHA-256: 985e5b118ac42be943caed4baae49d1f2d09e963b686575ea13739fa5d21d3e8

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