Malicious PDF — malware analysis report

Static analysis result for SHA-256 1962e977553f683f…

MALICIOUS

PDF

60.6 KB Created: 2020-12-15 10:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cfa506b16793832c5be1053e3107fa2 SHA-1: 156924d2bee3ac6ffbbe5cfbffaa128c6cdf4f66 SHA-256: 1962e977553f683f292ab2855ea68152d64af0cdeeb265166c8f074438a0d922
66 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded links, many pointing to disposable hosting services. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, suggesting an attempt to obscure the true destination or distribute malicious content. The presence of a URL with a 'utm_term' parameter further suggests a tracking or phishing-related campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://traffnew.ru/123?utm_term=west+union+iowa+hospital
    • https://xotagolopotipik.weebly.com/uploads/1/3/4/7/134713968/fawifi_pagabuk.pdf
    • https://loxigiberojawi.weebly.com/uploads/1/3/4/7/134770663/7309848.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/1818090.pdf
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/jatubepan.pdf
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/faedb9461.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dewazewokib/ark_survival_evolved_apk_free_pc.pdf
    • https://s3.amazonaws.com/gizonukorad/luvezobufofa.pdf
    • https://static1.squarespace.com/static/5fc0cc6dc14dfd36fef0f123/t/5fcb23a81df7590d80db0f2f/1607148457594/4598508960.pdf
    • https://static1.squarespace.com/static/5fc2acbc27a199023ac0d2d4/t/5fcbc9dbda45e86ccaacf2bb/1607191004885/sunday_school_lessons_2020.pdf
    • https://uploads.strikinglycdn.com/files/1269eb83-1f61-48e6-b8b9-190c4b76c6c3/90520014020.pdf
    • https://uploads.strikinglycdn.com/files/46653287-a631-4113-a511-0e211921d450/vitovaruvumarumuzubetu.pdf
    • https://s3.amazonaws.com/fixararololu/everspace_achievement_guide_and_roadmap.pdf
    • https://s3.amazonaws.com/pexodugosa/dibeturuxovuko.pdf
    • https://static1.squarespace.com/static/5fbfd008c14dfd36feeb1b6e/t/5fcf790169d6d06d55422a30/1607432450972/cheap_international_calls_app.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b19c.bin
b3e5119ecfd9a52eaa360064c49a5230d37b624980d05e4b3e504d31374e2b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 4916 bytes
font_01_sfnt_off0000c26f.bin
6853d4d0942d311e2530168ec4732b87f69bfcba0d05eb4a76529264e23dfbcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 10308 bytes

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