Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c470b13e857325…

MALICIOUS

PDF

67.0 KB Created: 2020-11-23 17:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a478149d14aadbf1eb87b543fe8e8a98 SHA-1: 9d4354ceb1f9da8e5b0cdbe523a82cf7f0bbaddc SHA-256: 05c470b13e8573257a8049a32f620789d48def8f4922f90881aa40138930aa96
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple links to redirector infrastructure, specifically identified as a link farm for SEO phishing. The primary malicious URL is https://ggtraff.ru/strik?utm_term=pathology+textbook+for+mbbs, which is likely used to deliver a secondary payload or redirect to a phishing site. The document body, though heavily corrupted, suggests a lure related to a pathology textbook.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ggtraff.ru/strik?utm_term=pathology+textbook+for+mbbs In PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/vipikibolajide_jadamowuxodemal_watefusobawale.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/6f2169971f.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/zofuwinezut.pdfIn PDF document text
    • https://soduwojipanaku.weebly.com/uploads/1/3/4/8/134865762/mifov.pdfIn PDF document text
    • https://lukozosa.weebly.com/uploads/1/3/4/4/134485969/2575142.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/20793f7d-aecf-4d18-a802-0b995964e78b/rojuvifolufakugelukori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed7fc75-a0a0-4bf3-b3a4-d2d7660d0980/logitech_setpoint_event_manager_startup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc36183e-3f33-4e41-8bc9-4c34cb622712/9251934207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60129d01-311f-44c9-8cf2-74a00a48c2a9/59432036600.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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 5556 bytes
SHA-256: b534a347ee5fe1fde16d174786ea2548dfefc583f45c389e8f27e01c944684d9
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 9992 bytes
SHA-256: 9261d40986d04aa4198323f9c205f990fb22ab56dab8c08a94f75820f299d0da

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