Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd16364694a273ae…

MALICIOUS

PDF

74.5 KB Created: 2021-04-07 03:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f792a840331292836af12eabc959fded SHA-1: 04a9730eb9e9325ec09aeda1ee63ed0b5774d1e8 SHA-256: bd16364694a273aefbd7ef5afd1f346799f04fee88c19f1e5b803a970b507838
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the heuristic indicating a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt.

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://fokemale.ru/123?utm_term=bluebird+of+happiness+tamar+braxton
    • http://stavki-na-sport.site/nutrient_broth_preparationxi8d7.pdf
    • http://dimax.website/whatsapp_plus_new_version_apk_freel7975.pdf
    • http://wowitaly.space/brand_new_science_fiction_zipccl7d.pdf
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/857f7c411fc4b.pdf
    • http://white-x.fun/putenebos1nma1.pdf
    • http://instapriz365.online/six_of_crows_2_espaol3hog3.pdf
    • http://rcasino.info/dijujomed8g9hk.pdf
    • http://silvanozito.online/sodejab4at1c.pdf
    • http://shtancircul.site/is_warhammer_40k_worth_itb0dv6.pdf
    • https://kobafadovuzek.weebly.com/uploads/1/3/4/3/134311208/2237631.pdf
    • http://gouliwer.online/america_history_of_our_nationgs6iq.pdf
    • https://jitijukuvag.weebly.com/uploads/1/3/4/7/134743274/cd8c9b6562f69c8.pdf
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/suzalonoxu.pdf
    • http://sport-stavki.fun/795718770841fnyw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://malejuvi.epizy.com/waraguwijowifa.pdf
    • https://s3.amazonaws.com/wizakokowe/technical_difficulties_video.pdf
    • https://s3.amazonaws.com/xapidajovaji/cha_cha_dance_performance.pdf
    • http://lakovejaduga.rf.gd/adventist_church_manual_2020.pdf
    • https://s3.amazonaws.com/gozilum/data_inequality_in_reasoning_questions_and_answers.pdf
    • https://s3.amazonaws.com/tanikanaw/arterial_pulse_waveform_analysis_ppt.pdf
    • https://s3.amazonaws.com/wurivuve/dinazofalivirimodemamuver.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_off0000e10c.bin
fdeb99872d745b7a03b8e63bcc9c94f26a6a86106889315c2859a6410bd375df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 5536 bytes
font_01_sfnt_off0000f3b4.bin
11a5926d08e1b2188bd48bc460f4867b07a292b7ea7090e5a517733b3bea25b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 11580 bytes

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