Malicious PDF — malware analysis report

Static analysis result for SHA-256 457cecf0e943309e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-05 11:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5fcd8fad3d1f7e47209fbd798aa73ba SHA-1: 51f4681244de795a4f5875ad12afbbea82f4035b SHA-256: 457cecf0e943309e6844d7a39f4553a2d18092847b933c4b935577d765a5903b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many of which are SEO-themed and point to other PDF documents, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure point towards an attempt to direct users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=hmh+personal+math+trainer+answer+key
    • https://cdn-cms.f-static.net/uploads/4457560/normal_601e8143bdebf.pdf
    • http://vexetifiridik.mypressonline.com/google_maps_satellite_view_history.pdf
    • https://cdn-cms.f-static.net/uploads/4479923/normal_60404c1acadd0.pdf
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/e90cb7.pdf
    • http://rodina38.ru/btec_level_2_performing_arts_draman1728.pdf
    • http://xitodefigatefuj.medianewsonline.com/gapodirofixagemiginera.pdf
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/4882494.pdf
    • http://bestcreditcheck.info/vekamalibu88m9g.pdf
    • https://static.s123-cdn-static.com/uploads/4367299/normal_5ff81b42391d7.pdf
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/2470316.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remeranexe/6th_grade_math_quiz_with_answers.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_02d48b49857842f1bec6cfcf09dfc4a4.pdf?index=true
    • https://s3.amazonaws.com/dibedamoka/english_vocabulary_exam_with_answers.pdf
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_e8d4f70690634d20925bd052eeda7cd0.pdf?index=true
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_b5c4ccce996c4a42b49b1477a8ec0603.pdf?index=true
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_62da599801bf43f0818b5f7272a847c0.pdf?index=true
    • https://s3.amazonaws.com/sabegokek/bully_scholarship_edition_apk.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_off0000e80c.bin
3fcebdef35dd990d79596524ed7b6cbfc712f8d74ba57110a6adfd90e5c0df71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 5280 bytes
font_01_sfnt_off0000f9e5.bin
9db3697106428f212d5e9517d2bc19df9e4da79ee7e362043eceba03deb49ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 13180 bytes

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