Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e258adde30f5e29…

MALICIOUS

PDF

72.8 KB Created: 2020-11-21 18:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4015952ab6f2bb2d87236b8493ac4e6b SHA-1: e2c8aec3636d349e93064ce04e5be282ee050f3e SHA-256: 8e258adde30f5e294c50409d5a1ed02dca610b64142222a615dd4491bba6b1a9
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one prominently leading to a redirector URL associated with phishing. The heuristic firings indicate the PDF is designed as a link farm to known malicious redirector infrastructure, likely for a phishing campaign. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to fraudulent content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/123?utm_term=free+iphone+6+plus+no+survey In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f930d00799d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_5fabaf91f2066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5fadd4f529d17.pdfIn PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/gisomutinom_tobafopimasuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_5fb35cd8ec0db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f90bc047c46b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5f9203a440b6f.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/6970754f-ac87-4ce4-8c09-ca67950c845e/45073098262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c343484-25db-4435-9b61-4af1f464cad3/27043878844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f231486-c5b6-47fb-85b3-a97af5ea7f7e/64151524743.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/classification_of_sedimentary_rocks_worksheet_14.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 4968 bytes
SHA-256: 6a608345717c23df30447bd72e63df2ad2e684be6ddbc244ed1232ca8296a0db
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11412 bytes
SHA-256: ff7956a0e5ce0bb580766618e2246e90553a8416f0a207f226197ac7f92cb8fc

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