Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e846f104829b14…

MALICIOUS

PDF

76.1 KB Created: 2020-12-27 13:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4d978fb2d3551cc5eaef7b167832ca47 SHA-1: 2d913f55a8d37bfb8ed53519f6e76a2310f57a4c SHA-256: 56e846f104829b14898787c5f1aae0104c79dda48e77755ccba6fd77267335a8
126 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using numerous small PDFs on disposable hosting to obscure the true malicious destination. The document body, though heavily obfuscated, contains references to 'spiral warrior modification kit' and the authoring application 'wkhtmltopdf', which may be part of a lure to trick users into visiting malicious sites.

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://trafffe.ru/strik?utm_term=spiral+warrior+modification+kit PDF link annotation
    • https://xulijuba.weebly.com/uploads/1/3/1/1/131164032/dexewenavefo.pdfIn PDF document text
    • https://xefosujusiro.weebly.com/uploads/1/3/4/0/134042031/7ba69.pdfIn PDF document text
    • https://xunatopek.weebly.com/uploads/1/3/2/7/132710497/3436946.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/376201.pdfIn PDF document text
    • https://widunamaki.weebly.com/uploads/1/3/4/8/134886597/kinuge.pdfIn PDF document text
    • https://powilamalowigos.weebly.com/uploads/1/3/4/1/134131405/wegut_metiguf_naroniguvoluvid_pujizavotukuzem.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/3jajaia/can_you_escape_2_level_3_skater_room.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/sepukowa_muzuzema_jamedanoveg_jonol.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/YhfteqW/kujakegifigipafutibasod.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/pemulu.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/fajonubinomeder/appu_movie_audio_songs_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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5384 bytes
SHA-256: 6dc777421a898befb3b1efc75fce8310e170be3ac5b4ce0fc8d1bc31433f7221
font_01_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 10916 bytes
SHA-256: 27bc00c3745cc0839c3b9a9507088555bb756f181d9774ffdab15220459eeadf

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