Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93fe41ef4f70779…

MALICIOUS

PDF

75.7 KB Created: 2021-06-06 09:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 38cbfbb50b4de746e5d315d4ed72fd7e SHA-1: e71d30f6a1c2d9d4c129892bf97d4b3a0588d1a4 SHA-256: b93fe41ef4f7077967030b11a9c973fb1512bba6d4fe485eb54517d8df0a277f
126 Risk Score

Malware Insights

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

The PDF contains multiple links, with one specifically pointing to a Java download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic flagging it as a link farm on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://smidgel.ru/pbw?utm_term=java+1.8+64+bit+download+for+mac PDF link annotation
    • https://rinefoza.weebly.com/uploads/1/3/4/8/134883618/lopafalaxiramuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420235/normal_60068d702e5b0.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/padomazozonimogodubo.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/jiwepupekefirorani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_600c8c742abce.pdfIn PDF document text
    • https://buwumesuja.weebly.com/uploads/1/3/5/3/135303403/sugupaj-bapif-saroxidemaxof.pdfIn PDF document text
    • https://dakuzewaki.weebly.com/uploads/1/3/6/0/136089440/7528136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a22553-82aa-4e0c-8f7b-7270054fb33e/how_can_we_send_and_receive_money_through_the_post_office.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/65682216291.pdfIn PDF document text
    • http://fekofowipuze.pbworks.com/w/file/fetch/144713382/how_to_program_a_gate_remote_control.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/21337722850.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/79130753169.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/oh_darling_chords_bass_tabs.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144469887/buxubitagon.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/actor_who_turned_in_queen_and_slim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb5c284-284d-4b65-bd3d-3192bcad651b/33627700845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a81ac3-4972-4a87-9565-01a2aabeb854/is_pokemon_tcg_online_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931d7574-c026-454e-9ab4-35c2ab561e46/pretest_emergency_medicine.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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 5788 bytes
SHA-256: 9dbb7cc5f1305a24165b0b7bf6ab73c6b78550e85e47d3e9526bd4d468d1a78e
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 14652 bytes
SHA-256: 3d5d9f303d40a5d02b29b90b2f40bcd75ef4e455a58334964a8a045dcea15d73

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