Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa03042790526b1…

MALICIOUS

PDF

89.7 KB Created: 2021-02-07 11:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 89f0ebe78c58298dd3234a1cb43c46ec SHA-1: cbbd17ea52a58ddea1aa4ba892a132b2489b8561 SHA-256: 3aa03042790526b1f7bec74d9a592a8a52063e5ad24ef672eeaeb1b6ce47b64a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear instructions or lures are discernible. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=i+sing+the+body+electric+pdf PDF link annotation
    • https://cdn.sqhk.co/dijogiper/bfRjboM/27471782251.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/hNihIJJ/download_carnivores_ice_age_full_version_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/JC9jcQh/62468358553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5ff06a0082b39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fc6453421942.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/5BijLjd/birthday_cakes_for_mens_50th.pdfIn PDF document text
    • http://nout-prokat.website/xewirqwrrs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_60109025334a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_6005ea161cada.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/egizjbC/dinosaur_park_builder_online_games.pdfIn PDF document text
    • http://kittyplay.online/184065945421xa0q.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/vibasujefir/whatsapp_status_2019_video.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/povufuxok.pdfIn PDF document text
    • http://pexedidal.rf.gd/cat_in_the_hat_meme_format.pdfIn PDF document text
    • http://kesuleruvepo.rf.gd/texokofegov.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/vakefogob.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/sprinkler_irrigation_system_design.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_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 5384 bytes
SHA-256: 2e07411779f1e993b41d3fd433d5b5c6e7b1b31054de1270ff8e590fa622a1ae
font_01_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 10796 bytes
SHA-256: 607cebb23b02860d17964fb3fbe4e9759d2720192391434e22fc3d9d2d56be42

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