Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aafcbda715c7e03…

MALICIOUS

PDF

74.5 KB Created: 2021-06-01 04:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03340422d59b0781862d312a689aba28 SHA-1: 5b25150938b7ef967a0b13ade8a9d18c2478bfde SHA-256: 5aafcbda715c7e037a4c7c57044098cc1a9afdefccecfd2f575100bd97bd8d01
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The primary malicious URL identified is https://pistant.ru/pbw?utm_term=gattaca+essay+questions+and+answers.

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://pistant.ru/pbw?utm_term=gattaca+essay+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426955/normal_6016838a20ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_60279ee24816c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonopewobu.pbworks.com/f/71147474544.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/repapuvobigajifatexulot.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/blox_piece_codes_september_2020.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144432663/manual_record_keeping_for_small_business.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/download_factory_inc_mod_apk_android_10.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144432363/pa_schedule_c_instructions_2019.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/what_was_the_ten_percent_plan_quizlet.pdfIn PDF document text
    • http://gaxoxim.pbworks.com/f/nadasoba.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/52100404785.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144424209/how_to_forecast_cash_on_balance_sheet.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/how_systematic_synthetic_phonics_is_used_to_teach_reading.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/bedejezezukaxigusapija.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/wekeboxodasoriwaxafu.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/zevujexanituketizepexop.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/what_is_the_difference_between_binomial_and_cdf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580c1562-8f23-46f5-a8b9-17c2a871af7f/53904338339.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144429072/40725066424.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413976/75834922639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fa1ead-ff6a-411e-8103-275bee89d489/popular_school_cheers.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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 5252 bytes
SHA-256: afd2dc520816f93132fe6a5dcfcfb89708ff953a76f21a995b9a786d478e84a4
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10660 bytes
SHA-256: b553a5c59db3a364af187fc9821375e930dae3cb962b01f8e28252b28f352435

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