Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c73186e6feea50…

MALICIOUS

PDF

70.2 KB Created: 2021-01-08 00:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5dcf4868540607c6d5fdddf5e875aada SHA-1: 1c4cb611fd3ef989021f25ebdfcee71ae44168d9 SHA-256: a0c73186e6feea501bb4f14a0b824bdc744971843c3d64e0db704c3440f65d6e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a domain associated with phishing or spam. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=where+to+get+your+birth+certificate+in+lancaster+ca PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5fae70994edc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5f9de8244b0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_5fd8988a824d3.pdfIn PDF document text
    • https://vesodadetuvi.weebly.com/uploads/1/3/2/7/132740638/3173864.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/gikebefa_mirefuf_mufoxijerum_mazojibub.pdfIn PDF document text
    • https://jenetekeze.weebly.com/uploads/1/3/4/7/134772573/1a1658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_5fad127c93b84.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/terisoseretexubesip.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/kotodur/disconnect_from_wifi_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/basic_atomic_structure_worksheet_back.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/gq_best_men_s_suit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/terraform_elastic_beanstalk_environment.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/del_webb_middle_school_news.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_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 5400 bytes
SHA-256: 551f4a9988b150893d87b5e52461a56ad596bda7b603741c95bd9c323357d0b3
font_01_sfnt_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 10624 bytes
SHA-256: 0fdee086eb03703bbd1705af9f412d1fbe0826cf562b447814b4881ceae7f4a2

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