Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c78c9c5949e4ddb…

MALICIOUS

PDF

111.6 KB Created: 2021-03-25 12:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d52b033a6cf252deac9f6f427f22cd5b SHA-1: b3c363cc90e28116b791f00964710c80953047b1 SHA-256: 8c78c9c5949e4ddbf30e4cae10af92638219188378fe5d6d7b688a00c7eefbd0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be related to search terms, further supporting the SEO spam or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=goosebumps+pdf+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392650/normal_605415ed63ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_601f3c396d84c.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/nespresso_f521_lattissima_touch_coffee_machine_black.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fcbb460062b9.pdfIn PDF document text
    • http://kajipim.mypressonline.com/31004211511.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/social_problems_community_policy_and_social_action_by_anna_leon-guerrero_6th_editionz4uia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_604d3127c0b59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5ff6379f4a202.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/centrifugal_compressor_surge.pdfIn PDF document text
    • http://usacreditscore.info/why_is_he_so_interested_in_me2ew83.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/9063314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_6030cb3a8c4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd1f7c77a220.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/ed0170679199026.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/fimumedezobina.pdfIn PDF document text
    • https://revubikuzopirot.weebly.com/uploads/1/3/4/6/134668280/tukigexajes.pdfIn PDF document text
    • http://tehnopolis.org/gajarekujuvonesenosuks0ibx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_604b655d9aad0.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/tivelubipopewopevato.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://uploads.strikinglycdn.com/files/341f32b7-2c80-43ac-8c6a-94f4c52ceedd/epson_wf_2630_cartucce_compatibili_non_riconosciute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc37dee-da61-4d0e-95a7-587761132f71/le_bistro_pet_feeder_instruction_manual.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_off00016aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAB 4892 bytes
SHA-256: ae60bcf44fffc9cdb0ae98b84266bc396d927fd1fa16cfd50eaaa0171c8b1488
font_01_sfnt_off00017b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4E 11772 bytes
SHA-256: 70c84709c98a90ae83649616c053bdd21a3c8c0b5de9fa3aec158cacb51a703f
font_02_sfnt_off0001a320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A320 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378