Malicious PDF — malware analysis report

Static analysis result for SHA-256 2477f9ce80725f9b…

MALICIOUS

PDF

75.7 KB Created: 2021-03-21 09:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d200b2553035d43cf209aeebb9ef7a80 SHA-1: 28ecd104e4b97a81bb9250f95d88f67fba6ffb45 SHA-256: 2477f9ce80725f9bf3468e78ff89da5b10f0dcf355b7b8048bdd357955894d65
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document is designed to redirect users to numerous external URLs, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external URI firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://bologen.ru/strik?utm_term=crusader+kings+2+mods+mac PDF link annotation
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/9676313.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/1ea22acd02.pdfIn PDF document text
    • http://canonsburglake.org/what_does_an_international_lawyer_docwk4k.pdfIn PDF document text
    • https://gulezawajure.weebly.com/uploads/1/3/1/8/131858287/fuzimotolow-dofemobosiliz-bivowo.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/cBhchbt/the_walking_dead_season_2_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/dR1ib26/xazuve.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/dcicqPn/best_skee_ball_app_android.pdfIn PDF document text
    • http://you-bestshop.xyz/nizefinisimoqa8rz.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/8hjijib/dizefajef.pdfIn PDF document text
    • https://rokotejipap.weebly.com/uploads/1/3/0/8/130814190/voripapegawurolitu.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/febopa/39791156631.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/2019_civic_service_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/80117187213.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/47566836206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb098a7-553c-454e-bc28-5fc448128f88/sketchup_make_2015_mac_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/baccho_ka_game_kare.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/noxonidakoxor.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/auxiliary_verbs_and_modals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5767b7-9172-44cb-8fd9-fcbb41ee22c9/craftsman_table_saw_motor_brushes.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 5328 bytes
SHA-256: 4ed9ca2dee149eaecd20602a5a68449999996ef1d0d0f785f868e91d226701f4
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 10864 bytes
SHA-256: 14e227bbeeadc0a260bb95f7e9e5b728b57ae7bb2d72290789ab4effcef67599

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