Malicious PDF — malware analysis report

Static analysis result for SHA-256 5693a66074fc8f13…

MALICIOUS

PDF

79.1 KB Created: 2020-12-25 12:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 51a936355de347000a949be97767b8c1 SHA-1: 9ce16c6734dd1f57126e8fd39397d06d3621b3fd SHA-256: 5693a66074fc8f13f4405d24338ee47f00b8ba25c1a3146bc4f6e0f59052b356
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 a critical heuristic firing indicating that it links to known malicious redirector infrastructure. The presence of a large number of external PDF links, many pointing to SEO-optimized content, suggests a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

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.
  • 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://traffmen.ru/strik?utm_term=winter+capsule+wardrobe+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd0a6d347c11.pdfIn PDF document text
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/jurarogexegawevawewa.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/815b7eec.pdfIn PDF document text
    • https://madudezogimune.weebly.com/uploads/1/3/4/3/134326665/6423596.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/6911613.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/zomevix_pegunoje_sobevum_vumopexemenom.pdfIn PDF document text
    • https://lajadarizigatu.weebly.com/uploads/1/3/1/3/131384611/goramizutodixez.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/dekogamik/8836341574.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/sharpening_guide_for_chisels.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/vugumewawateposamek.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/33083170497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913ce042-56e8-4540-8b43-5e1d219a9b2d/76841096177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15292dd-4c65-4eb3-bb9f-3a9296376614/substitute_for_parchment_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/80918386273.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_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5312 bytes
SHA-256: 8f80ab9db1af2b30a2a8f2ff9d4f4c13827d3e3012b2ca7e202ea69326da5f81
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 11312 bytes
SHA-256: 3ae617e54fb1bdda7e5e320dc063d99bc82a45413a940837316c3fa9a14b3d3b

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