Malicious PDF — malware analysis report

Static analysis result for SHA-256 638e38e0437513fa…

MALICIOUS

PDF

66.9 KB Created: 2020-11-30 22:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 729d87220e9ff29d4b4984ed1e25b5ff SHA-1: d327e8313d9fb32155802906e40be840d254c34c SHA-256: 638e38e0437513fa08f0980bd7b5b22192992bc2a87736e32988506e9f5dca7a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=3.5+forgotten+realms+campaign+setting+pdf In PDF document text
    • https://sagudazotimoja.weebly.com/uploads/1/3/4/7/134753003/1669f630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5f9c4c750626e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5f995b6a78556.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/9432874.pdfIn PDF document text
    • https://labegemi.weebly.com/uploads/1/3/4/7/134709462/mozokekefetefu.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/3494599.pdfIn PDF document text
    • https://mosodujisar.weebly.com/uploads/1/3/0/7/130739504/dazexaso-mumagikadadada.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/d32d0d80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5f9df624944b7.pdfIn PDF document text
    • https://durabaseduxoj.weebly.com/uploads/1/3/4/2/134235759/147574b94c12e9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0fd9af9866f3fd2d4d777/t/5fc2b61918e72e5fdb310038/1606596122014/1186839576.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_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 5700 bytes
SHA-256: 0c06929ac26ceff5a8ca8d04deb61af1b6f87ba41877918ac3eb7a1b1e2cae30
font_01_sfnt_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 10600 bytes
SHA-256: 23ea5a234af9b6b5f9e4cdb5a1751a27affbe5514d0e738ab26c3c7ab5057943

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