Malicious PDF — malware analysis report

Static analysis result for SHA-256 a345f04dd33ba6ef…

MALICIOUS

PDF

94.2 KB Created: 2021-01-06 03:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1b467440f6290bf05de65804291b3d59 SHA-1: 927753cdf36b5bf9bdf6a609b259037cec3e41f4 SHA-256: a345f04dd33ba6ef8149223557eb44341e81e820ddb439e9da709d2409a5efb6
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDFs hosted on disposable domains. The presence of XFA forms and embedded URIs suggests an attempt to redirect users to potentially malicious content or phishing sites. While no specific scripts were extracted, the overall structure and heuristic firings strongly indicate a malicious intent to distribute or host harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://trafffi.ru/aws?utm_term=azilsartan+vs+telmisartan+pdf PDF link annotation
    • https://cdn.sqhk.co/perigupa/uihc58r/audiotool_download_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/hdjd1hj/shenandoah_national_park_guided_tours.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/lubarolofozetikafa.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/5533358.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/ibjggcf/screen_recorder_windows_8_with_audio.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/devenelularem.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/xetixewokokix.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/6gjjhx1/key_battles_of_the_us_civil_war.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/doxovemerugil.pdfIn PDF document text
    • https://walagewujiw.weebly.com/uploads/1/3/0/9/130968979/d26a3cd24.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/dbed2d572e9.pdfIn PDF document text
    • https://cdn.sqhk.co/murevexi/QjchdoV/dining_table_set_with_bench_and_leaf.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/xowuzamew-bisedoxe-mosinogazuzuduz-pinosuses.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zonebon/linkedin_video_er.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/zirajafesafuwajero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 4964 bytes
SHA-256: 7e0204298baa19b9b3f05989f44139e34b78d710f3ea8c4a0d6f6d8762d8b6e4
font_01_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 11864 bytes
SHA-256: d17450fa2cae606335e88f460b205f953e2aff30df367ad104696526df343ac7
font_02_sfnt_off00015d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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