Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad48c7fa060eb383…

MALICIOUS

PDF

85.2 KB Created: 2021-04-06 14:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7db14ff310cbfa0e3786316189c1a50 SHA-1: 98b6e982a3c8b0b1f61e2568bf416ad5634a0a5a SHA-256: ad48c7fa060eb3838c01ec29611e64916cd252552afe99a9e7be85346dec2047
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('midufefew.ru') that is likely used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational content, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=16.1+properties+of+solutions+worksheet
    • http://boxidodo.22web.org/leadership_interview_questions_and_answers.pdf
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/6b739a.pdf
    • http://kiwedoro.66ghz.com/kamudufalel.pdf
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/kuxubakuvaref.pdf
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/9059835.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a449479-9bad-4f9b-9d68-ad80b3c9a347/54784372633.pdf
    • https://s3.amazonaws.com/dazinibonofobi/mortal_kombat_9_android_free.pdf
    • https://uploads.strikinglycdn.com/files/891a39d0-3dee-4f10-ad90-3d6300871d18/vegan_keto_cookbook_barnes_and_noble.pdf
    • https://s3.amazonaws.com/sugowubuf/tofuzaburovo.pdf
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_b6c2e09258584ce6b807e939e3bbea51.pdf?index=true
    • https://s3.amazonaws.com/sajezife/bloons_tower_defense_6_unblocked.pdf
    • https://s3.amazonaws.com/pegebunov/36920777549.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_4f84bae956ac492ca8dab46d988a5230.pdf?index=true
    • http://rozopujonabesix.epizy.com/pisokipawabekurarowikuxe.pdf
    • https://uploads.strikinglycdn.com/files/0d84cd67-cbad-4aad-ba87-55b9f4e047e7/wabefozinigejiladojoramas.pdf
    • http://pidulejos.epizy.com/chicken_soup_for_the_teenage_soul_excerpt.pdf
    • http://buvumurasamaku.rf.gd/sezafupikafizafulivutisi.pdf
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_ce9f18a704c04d1dbc544119da4e6e45.pdf?index=true
    • http://tanowopi.epizy.com/naxivufo.pdf
    • https://uploads.strikinglycdn.com/files/2f5bf3ef-b68a-4df8-b95d-ea35680bcf0e/78291022081.pdf
    • http://dixegozep.rf.gd/91022290647.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_off00010e02.bin
5c42736008839791eb0b0e39171106244beaaa7ee81588e0ededc58398a5340f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 5080 bytes
font_01_sfnt_off00011f62.bin
ad6530c886e61d2b3d4ca7cc143bc05c9ba7251ae4fa4c8728e914fc68815903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 11292 bytes

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