Malicious PDF — malware analysis report

Static analysis result for SHA-256 03690bda35aba68f…

MALICIOUS

PDF

68.0 KB Created: 2020-11-14 11:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5453fd2f47038a69d9bf2bb1f5a8a960 SHA-1: bdfc273da4011611c9cb6683a01e13015200d28a SHA-256: 03690bda35aba68fffce1d6e8113bedbe4e105055790f42aeb53bc30b73d76e4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable domains, a common tactic for SEO manipulation or to host malicious content. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of numerous links to PDF files on disposable hosting services suggests a link farm or redirection scheme.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=precious+moments+collector%2527s+guide+2 PDF link annotation
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/4266702.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/a615c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5f8e4cac176a6.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/865368d66db3.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/4d461aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5fa29825e254a.pdfIn PDF document text
    • https://miwomineferele.weebly.com/uploads/1/3/4/5/134514444/pegewujuxukulexelevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_5f9d036ac2839.pdfIn PDF document text
    • https://zexaloguf.weebly.com/uploads/1/3/4/5/134576330/tutejet_nepavure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fa51a0a62ce1.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/82c32ef9a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5fab51fb1f6fd.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.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/roxawo/international_council_for_truth_in_medicine_diabetes_patch.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_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 5216 bytes
SHA-256: b50ff55b0bfba65d7767b92b086189894cf4ddb046a2c01a250edae797d6275e
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 10096 bytes
SHA-256: 2a93be0e4fb0fc085eccfc9b2c94595ffe1e206e10453e188f18e732c743d7d3

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