Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60d15381f6a0bc6…

MALICIOUS

PDF

66.4 KB Created: 2020-11-13 07:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d191fbc22b4c5fc7b175e576cf8f5f49 SHA-1: 8be87bc8db2cab231310ebc752c6803ceed9de4e SHA-256: c60d15381f6a0bc64f8663f6fce8d4af0230d81639ffe49d0c63b3886af032d3
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, and detected by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://trafffi.ru/aws?utm_term=lab+safety+cartoon+worksheet+answer+key, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

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
  • 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://trafffi.ru/aws?utm_term=lab+safety+cartoon+worksheet+answer+key PDF link annotation
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/fovoterawogisujaj.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/moronakaxame-lewige-kiwumafaka-poxakajibi.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/5daf65d3005d74.pdfIn PDF document text
    • https://felupujefokedab.weebly.com/uploads/1/3/4/6/134621420/2d39bb2cd505b8.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/9d2e3193-5e15-4e98-8c01-e20f65d9cdf6/bleach_opening_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f516a025-cb70-4d1f-9761-7a2b2bcbf7c3/52738010044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedd1498-17d5-4f2d-8b16-13df55ba991d/2277424519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73fad72-d2af-4c2e-8fe7-eb33d8bf8a09/zifojesapiton.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/wow_coarse_thread_brill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee94b39b-0246-453c-b5c3-fa7fd6602a9b/22852775390.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_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 5276 bytes
SHA-256: 597e45bc7110d391ed2c3e80976c826131b0ecf88b7232587fdb7327e7aa5573
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 10776 bytes
SHA-256: c4812edc127b258fbbc25f8dc9030428b45ee12eb916103475967527a24dd783

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