Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd034e0edf7b377e…

MALICIOUS

PDF

56.5 KB Created: 2020-11-14 09:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 13356f92456b311eda5d323c8d946c29 SHA-1: b6aba106d2e3fface99bf15286ef5a7ee3958855 SHA-256: bd034e0edf7b377e482b7dbaed57c3bd0f4d74924bb47ccea75600d509b715f6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure for downloading a PDF related to human history, likely a pretext for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=a+brief+history+of+humankind+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422914/normal_5fac4a7e9ecc8.pdfIn PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/5891672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5f99c35411c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_5fad26979d0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f876360e16e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5fa0d5e234e2a.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/5396483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_5fab5f5c3b7bb.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/lomogas/bodyguard_telugu_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45dc0af1-1554-443b-ac9e-27225a62c10b/8420940895.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/android_10_update_for_oneplus_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83435e7-016d-4db1-b41f-c79ca046ceae/mugomavofimaton.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_off0000a503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA503 5668 bytes
SHA-256: f172f92b2eedfed8992bd3aea1c214b50d4de97295b8f542b1594e92e79c979f
font_01_sfnt_off0000b82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82F 8556 bytes
SHA-256: 68b482fb36d7d054635338557e71013921880827a73f00752da27e120c09e5df

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