Malicious PDF — malware analysis report

Static analysis result for SHA-256 905af8ec849f0a93…

MALICIOUS

PDF

83.4 KB Created: 2021-03-23 21:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b1457ab47ac488c6129481a6fa16ca29 SHA-1: 6f166c12d262a4d17efbe5e255ae973d09d05929 SHA-256: 905af8ec849f0a933a4d6181af48490d891f1f9d8a84d1180814cc9a3aa52e03
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'bologen.ru', which is likely part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/award?keyword=biology+investigatory+project+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408343/normal_603e1621904b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_605547e08aea1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5fc812273deb9.pdfIn PDF document text
    • http://oneitstore.pro/46345718115o9cuh.pdfIn PDF document text
    • http://lilakasidosusuw.iblogger.org/lugisobibodowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_605221e007ec5.pdfIn PDF document text
    • http://construt.site/ps4_platinum_headset_keeps_disconnecting0u5kn.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/xukanomarexumu/91993114434.pdfIn PDF document text
    • http://judofejigijejig.rf.gd/stinger_mosquito_zapper_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/how_to_become_a_good_christian_mother.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/list_of_coordinating_and_subordinating_conjunctions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/991d41a8-3d58-4e42-8ecb-bbe4cf6d4e08/twilight_midnight_sun_movie_release_date_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/why_use_bayesian_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/mexifap.pdfIn PDF document text
    • http://zukizibukuxupir.epizy.com/zufeniwapirusigonafeva.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/firebase_android_tutorial_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed8aca4-d304-4d81-834b-954166875dd4/manual_de_supervivencia_militar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4816b7-deb7-42a2-b564-3ce31293ca50/the_communication_age_connecting_and_engaging_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/70071695765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ef06b4-1dcc-4896-ba3d-901df054b8d4/what_was_the_us_constitution_influenced_by.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_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 5700 bytes
SHA-256: cac655304ebb0b4095bb19778ac6724f7f51c01782838d28ecb517b827ac28a6
font_01_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 11540 bytes
SHA-256: bc8848b34efaea2bfef719de07c798ecaa7d9580ffa359dbddd280d68add9505

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