Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8cfb3b92b4965e…

MALICIOUS

PDF

69.4 KB Created: 2021-03-11 01:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1d85decf6f925904823109045c915843 SHA-1: 446be2d49ed2b8fa5ede341e560a8899594587d3 SHA-256: 4e8cfb3b92b4965e1270aa013a1033f491f527f1a46d4b443ccc2299b7d47b55
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, suggests a 'black printer test pdf' lure, indicating a potential phishing or malware distribution attempt.

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://nipisod.ru/award?keyword=black+printer+test+pdf PDF link annotation
    • http://vasugixoba.22web.org/movie_counter_2018_bollywood_movies.pdfIn PDF document text
    • http://tryici.xyz/simple_java_game_code_netbeans7x84m.pdfIn PDF document text
    • http://bubiwikozexamo.iblogger.org/25341775554.pdfIn PDF document text
    • http://boevoenlp.com/jixozky4jh.pdfIn PDF document text
    • http://sagebiwepul.22web.org/what_is_international_financial_services_centre_ifsc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovarede.rf.gd/96268502267.pdfIn PDF document text
    • http://pigasupozev.epizy.com/tunatevujelinowupubikugu.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_c1ddd2a559534eac9ea9b7d3d4245a47.pdf?index=trueIn PDF document text
    • http://gevorewububew.epizy.com/tofarunafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccecd5fd-8e0c-4b78-a1b9-95319f049280/su_lenguaje_corporal_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/model_3_range_loss_in_winter.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/redmi_android_10_update_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/bumonugebozi.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/guided_access_mode_ipad.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/9581177666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1bc4ba-5c16-4fa5-aec7-80de6806582b/mokolisimivawasorofegaton.pdfIn PDF document text
    • http://jipinasin.epizy.com/keto_meal_prep_amazon.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_0b89eabaa7054012b74c496936668e19.pdf?index=trueIn 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_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 5260 bytes
SHA-256: e4c9f431315b6be01140868c4e2eec5878b64dd1c28210d0743d5fd601c31386
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 10412 bytes
SHA-256: 27d33e89c2cdd8b7b3151589363b64257ec7aa6b639edd6f0f156b575a4f2514

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