Malicious PDF — malware analysis report

Static analysis result for SHA-256 730a4f1ec1d28ed1…

MALICIOUS

PDF

72.0 KB Created: 2021-01-02 06:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ddadd3f593228213917e66854808af1d SHA-1: d2750bfc2b0a2ffead4c50eb70e0c301476ed3b9 SHA-256: 730a4f1ec1d28ed15294fdde154a41b1b222dee168bfa6dd02109d81b9c2f655
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing a large number of embedded links, many of which point to external PDF files hosted on disposable domains. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, and another identifies it as a link farm. The ClamAV detection and ML classifier also flag this file as malicious. The embedded URLs suggest a phishing or SEO spam campaign, likely intended to drive traffic or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=usmc+assault+pack+waterproof+bag In PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/d945166f58.pdfIn PDF document text
    • https://tajedapen.weebly.com/uploads/1/3/4/3/134373213/milajidutiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc9378f8aca2.pdfIn PDF document text
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/8617175.pdfIn PDF document text
    • https://cdn.sqhk.co/bojidokagivi/R7TghZK/jagematiluga.pdfIn PDF document text
    • https://jimatekazame.weebly.com/uploads/1/3/4/6/134669874/b8caa1.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/hc2icX2/nobosopejof.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/1530f.pdfIn PDF document text
    • https://zekulosig.weebly.com/uploads/1/3/4/6/134689557/29e8f150a.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/jhiehgP/4115226212.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/a4ed2281-9b79-4141-b1b1-a6f953655a3b/world_war_z_classes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c28bd9-49d5-4255-8518-ccdfe4d31639/wuwuvenadukagedagab.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_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 5624 bytes
SHA-256: 28c8a35e11cd08f80cd7fd53a9e916ffd6737c6db3aad4a0bdc120fa186418e4
font_01_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 13360 bytes
SHA-256: da656ef3793c8d3cc21c68b08495b70441aaa5c8c126b7e0624786b99cda311c

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