Malicious PDF — malware analysis report

Static analysis result for SHA-256 b658cd3bd0fe9dc0…

MALICIOUS

PDF

83.6 KB Created: 2021-01-06 20:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c2e8da7d163d22a91a878a66565b884e SHA-1: c838fa1341e6cfe7672ae86a378c9066bde25855 SHA-256: b658cd3bd0fe9dc0c96cab7cfd41b35ca3cbb98828a72f259e7d7f1c9dfe75da
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The presence of a URL leading to 'traffine.ru' with a 'utm_term' parameter suggests a phishing or redirection attempt. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=buffalo+breeds+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fd65c4217d71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5fde069270b1e.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/1667322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_5f9ec70c25da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_5f9b5514b5e55.pdfIn PDF document text
    • https://detawokigar.weebly.com/uploads/1/3/1/4/131453745/2111272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5ff11bafef80d.pdfIn PDF document text
    • https://galibemad.weebly.com/uploads/1/3/1/8/131856827/nuleluvorovugokijexi.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/yahh3gh/6766526.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/fogubibokulirikag.pdfIn PDF document text
    • https://vamubediva.weebly.com/uploads/1/3/4/9/134901044/bomalemabubekor-jipoxepatupiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fe24fb53c3cb.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/8c52ddbf-808d-40eb-93d0-122257b785e9/wemebowasi.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/tamil_guide_for_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c704b76-1652-4ab5-be4f-8c4b2cedaacf/lego_marvel_super_heroes_cheats_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/hit_the_dance_floor_song_mp4.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_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 5224 bytes
SHA-256: a8cc329de1940c3b3efcd7eb2bc1fe0ee828c746636872cedc2878dbecd13ae6
font_01_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 10396 bytes
SHA-256: 4707218f70ec4f579d232e61dd6ee1a5377153b29c1e8693704cefde4f6b74a6

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