Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a4bd79ab0b09c3…

MALICIOUS

PDF

100.1 KB Created: 2021-03-14 22:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0182db5273aa2575144a0ea1cf1fad04 SHA-1: b3861473ab5fbf64379b1d6fb7d650e7ae73bfca SHA-256: 51a4bd79ab0b09c30981228fd731c4880cd75657056080a1b4063ee1c8aa9805
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of numerous external URIs and the link farm heuristic strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=rift+hammerknell+raid+guide PDF link annotation
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/besenopebobor-nufatizafulul-ravixap-tolabuw.pdfIn PDF document text
    • https://fixupusojorulu.weebly.com/uploads/1/3/4/4/134438709/zutadusetiboka.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/ifiagh0/tudavatiseworunegorujiwo.pdfIn PDF document text
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/2e0fa9d.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/ranaropitul.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/nhgAPTG/lipix.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/6899975.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/geenjja/35063757548.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/122341.pdfIn PDF document text
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/jofufo.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/2536400.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/sepefalamonu.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/C3gicge/zabaxupi.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/dv0Rc88/mogolozepes.pdfIn PDF document text
    • https://divowugu.weebly.com/uploads/1/3/6/0/136022164/fiwifa.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/numegubowalonan/adobe_premiere_rush_download.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_6211027e80274cf484643f147a72e139.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_ce61657399dc4c27bf5509589989bc7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/61197923499.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_off0001498a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498A 5212 bytes
SHA-256: 7bdc1cdb28c5e45f53ea0686e8983871a3619834bc4b4262ec623dc0501222c6
font_01_sfnt_off00015b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B21 11348 bytes
SHA-256: c7ec9aafe204f9ff33e48b3d2ad046c8b8399be35c42ff4e21c2bf3077d433a9