Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cbb6dcc44f51c3…

MALICIOUS

PDF

72.9 KB Created: 2021-03-17 06:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 944972d9ac0637e365635be1dfea5629 SHA-1: 3b1078e0ca7d5240ab00ace17f385fa14bc2b4d5 SHA-256: 87cbb6dcc44f51c3a181432ec617c38bef6ceafba657b6385e9102b78675615d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'midufefew.ru' and a keyword suggesting a lure for downloading a PDF. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=learn+autocad+basics+in+21+days+pdf+download PDF link annotation
    • https://romizipomubem.weebly.com/uploads/1/3/0/7/130775952/zekudojinelixa_zizab_zufekifu_ranevifogup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_60342a5f1fec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5fe384c91e050.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/4jayvKX/zisimegonupopupumixo.pdfIn PDF document text
    • http://copriyghtconfirmed.com/mod_medyan_standart_sapmaxbzdi.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/gcig85a/78063528822.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/idjhgGt/regal_cinema_16_closing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_6036de6764884.pdfIn PDF document text
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/xatojinerivoki.pdfIn PDF document text
    • http://kayikciakademi.com/33949074208tk9xj.pdfIn PDF document text
    • http://bestunew.xyz/pijurofax0zddv.pdfIn PDF document text
    • http://antileqphh.site/pagufimagaxudantyjq.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/ihYjeXd/pazuxomowetozori.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/bheoTgj/calendar_template_2020_printable.pdfIn PDF document text
    • https://timokejega.weebly.com/uploads/1/3/4/4/134454798/5774740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_602622c40670d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_e388723c58e44e81a7b2ede2fe4c3c38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/silofijujiwigejevuki.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_1a6a1e9ff3674144bbe6c366994a3f14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/doxifuba/the_heart_of_darkness_summary_shmoop.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/xovutotupowufove.pdfIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_00e576eb4b0a4ae1ae0ba2b5be45bfc3.pdf?index=trueIn PDF document text
    • https://play.google.comIn 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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 5608 bytes
SHA-256: b8cfd63289ff9e0dad63f0ffddfa995341dba1d3f6b959fa174b13fbe4a71142
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10244 bytes
SHA-256: da8535ff65153a9aeed772e7814a48c3262a59ed95b2d61b3e501cabf6f9125f

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