Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fa4de208b90861…

MALICIOUS

PDF

89.8 KB Created: 2021-01-14 23:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a52608385343b0c3eba46e3b2069c7ea SHA-1: 7917c3539742924c616c33f9c0b5e1b25d580fc8 SHA-256: a8fa4de208b90861cd6e66910c282859692b49e94da25a0be2253e6c2f70001f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, and is identified as a link farm. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially malicious external sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=pratt+truss+bridge+calculations PDF link annotation
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/wimakapiz.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/68710766374.pdfIn PDF document text
    • https://larogarokod.weebly.com/uploads/1/3/4/0/134018293/nufezixisewasip.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/GWbdhf6/extreme_car_driving_simulator_3d_mod.pdfIn PDF document text
    • https://site-1178325.mozfiles.com/files/1178325/51444269138.pdfIn PDF document text
    • https://site-1173240.mozfiles.com/files/1173240/777_live_casino_app_gold_bars.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/jEW6hfB/what_scary_movie_should_i_watch_quiz.pdfIn PDF document text
    • https://vagoledos.weebly.com/uploads/1/3/5/3/135320004/b03ffe.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/13d20693ef.pdfIn PDF document text
    • https://site-1177330.mozfiles.com/files/1177330/xovomemokovaxa.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/senodiw/89775469859.pdfIn PDF document text
    • https://s3.amazonaws.com/radaruropivoje/vopegojepujivosip.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_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 5248 bytes
SHA-256: 5e49eb247b5a01ac57509aeea2d3da627df48ed92632946086fa0b2a4785b9b3
font_01_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 10380 bytes
SHA-256: 467e5b198d6d23bac4385ad4ba488fd1b0468b3208a7f759bd6c514bb2873d93

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