Malicious PDF — malware analysis report

Static analysis result for SHA-256 231fe3a409fcdf87…

MALICIOUS

PDF

81.6 KB Created: 2021-03-22 15:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4d9df53a88151e99e8f8320f44c684d6 SHA-1: c721c037a7d72a1e341c4b5e4d413c3e863176c2 SHA-256: 231fe3a409fcdf87c2c1872d6a194f6a0e00057d3dd003978985cda49dd1f18e
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, and is flagged by multiple heuristics as a link farm and credential phishing lure impersonating Amazon. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/7038436.pdf.
  • 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://jottigo.ru/award?keyword=accounting+cycle+exercises+with+answers+pdf PDF link annotation
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/7038436.pdfIn PDF document text
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/vumejaposebe_zazepiv.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/4b666b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_60160845f15e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_601bdd5937d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5fd2d8e6eaf0e.pdfIn PDF document text
    • https://fapirezomamu.weebly.com/uploads/1/3/4/3/134382700/xemutema.pdfIn PDF document text
    • http://jegipebor.iblogger.org/boy_scout_abuse_settlement_amounts_reddit.pdfIn PDF document text
    • https://vosuzujil.weebly.com/uploads/1/3/2/6/132681517/pegasikinafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_60293f3c88daa.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/2068353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_6016546e5eac9.pdfIn PDF document text
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/3025043.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
    • http://tatefes.rf.gd/85244808629.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/anorexia_nervosa_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/esl_future_in_the_past_worksheet.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_d6b3f34623424f7494918ad873e0f8b0.pdf?index=trueIn PDF document text
    • http://ralewawixofax.epizy.com/2019_tamil_movies_audio_songs_free.pdfIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_2798a3d632bb4be980a074b05aee436b.pdf?index=trueIn PDF document text
    • http://fowasabitafal.epizy.com/emerson_mass_flow_meter_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/11685714357.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/spore_forming_bacteria_are_capable_of.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_0b0208cecc774f89ba329d953765b4c7.pdf?index=trueIn 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_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 5552 bytes
SHA-256: dbf3e1184bd00b87f79496571e5833e4cdfd8bd93d29d0ac0d8815395da2fafa
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 10536 bytes
SHA-256: 5daf037606515e0d3e0b6a78c5de58c426f8e093529a71b867ee1ca18962b18a
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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