Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32f7921b9abf0bf…

MALICIOUS

PDF

71.0 KB Created: 2020-12-16 04:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 11e9f26f2847565596e004f50a86c0e4 SHA-1: f636665f759b71f914be2085a0629c4f7b4faea6 SHA-256: c32f7921b9abf0bf633cbf38eaad90fdf50e5e7965fca1d6871be43323571d35
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links pointing to external PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The presence of a link to known malicious redirector infrastructure and ClamAV detection further supports its malicious nature. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://traffmen.ru/123?utm_term=boy+scout+belt+loop+display In PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/7566354.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/815ac0252b9d6.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/nasunilo.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/vuxejirasuve.pdfIn PDF document text
    • https://jumegelizo.weebly.com/uploads/1/3/4/7/134712838/zivibonu.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/wuxewase.pdfIn PDF document text
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/96cac98e.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/9609319.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/musutixitavik_ganiwe_kanuraza.pdfIn PDF document text
    • https://bexizesuxeneze.weebly.com/uploads/1/3/4/6/134634073/fbbde97e4d8b8.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/9df76216-dbd4-4b91-bc79-5d16d3838fa1/galaxy_7_edge_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae73e4d3-db50-49ad-9b9b-798239981b1a/witolagosalopepapunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b21784-2fe4-4ee6-b0ba-8de9268e02d1/37487202008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1b369a-bc76-45b3-830c-60d39714933c/tolemejelowiron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc36600-826f-4214-a65c-68f0f77ee25b/skill_link_pokemondb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60343f76-ba9d-46bc-b206-978f439210c4/kezololupitugiju.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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 5264 bytes
SHA-256: aa02bf27b6619f0a6d36cb4c4c0ca5e0bb148e395f5a447103b30e550a78feaf
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 11556 bytes
SHA-256: 6270890cbf86216a24489454f294609566c85ca13ca4a946b15445707c0cccc0

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