Malicious PDF — malware analysis report

Static analysis result for SHA-256 653e4d6a328fa4c4…

MALICIOUS

PDF

81.8 KB Created: 2020-12-27 16:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f945f3f5ba74f31991bd8d8edd44d8cd SHA-1: 994f41040dfbe6c47f00cdc95dd7fde4531fce45 SHA-256: 653e4d6a328fa4c4c8dac3c016e2873287689886d4014bd1933f05945ce7a251
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and point to redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt, likely using embedded JavaScript to facilitate redirection.

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
  • 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://gettraff.ru/123?utm_term=the+serengeti+rules+book+pdf In PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/d509105758e8.pdfIn PDF document text
    • https://kajagutodadu.weebly.com/uploads/1/3/1/4/131437420/vumapuxinib.pdfIn PDF document text
    • https://kipuveleg.weebly.com/uploads/1/3/4/8/134851645/d80ec3da3.pdfIn PDF document text
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/8663277.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/c0f56e8de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393359/normal_5fdff9d81724f.pdfIn PDF document text
    • https://juderesovabivov.weebly.com/uploads/1/3/4/6/134680251/db911ed74.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/4f035e92-74f7-4ad4-b307-be90a4291c18/chi_power_training_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffaf3f2-2d77-4556-9d5b-7f52be2475c7/vetuxarupabavuvutukuz.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/movie_trailer_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/togezi.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/circular_saw_guide_nz.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_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 5248 bytes
SHA-256: 1a757808772acd40da847c6a6cac791692a5806b629bad2aa46431dc767c8d19
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 10692 bytes
SHA-256: 7c971e3d0d068e9cfba87c5339467cd0fc35a97f5f2c9607fa92d61f4f496792

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