Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59cff8f15ac885f…

MALICIOUS

PDF

104.1 KB Created: 2021-04-25 19:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3a1a09b1dcabc1a6457574c22b1254a SHA-1: 45d388907b391ab72bafd554ba42b6f0b5032039 SHA-256: b59cff8f15ac885f77f02b151e1d6bd280d572cf367b57c7ad7e168937a169d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to suspicious domains that are likely part of a link farm or phishing campaign. The presence of external URI heuristics and a high number of PDF links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dafemum.ru/strik?utm_term=less+than+zero+novel+review
    • http://arm-watch1.club/2859455492051met.pdf
    • http://devlp.design/introduction_to_ergonomics_bookxvqhj.pdf
    • http://foxiduwanati.mygamesonline.org/17375967766.pdf
    • http://ecoterritory.store/why_will_my_furnace_not_light6voto.pdf
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/sepuwenulazuwikiwepi.pdf
    • https://static.s123-cdn-static.com/uploads/4486984/normal_6006d50acb79f.pdf
    • http://vuwiwetidajin.mywebcommunity.org/c_language_interview_questions_and_answers_download.pdf
    • https://cdn-cms.f-static.net/uploads/4417033/normal_6060220ad144b.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/c77c18884.pdf
    • http://tonerinkstore.com/grade_7_math_word_problems_with_solutions0ijtm.pdf
    • https://cdn-cms.f-static.net/uploads/4368979/normal_6048720ac79cd.pdf
    • http://vitonidero.medianewsonline.com/bacterial_growth_media.pdf
    • https://cdn-cms.f-static.net/uploads/4366347/normal_602984d1c75e3.pdf
    • http://pusovemolexed.scienceontheweb.net/24360954980.pdf
    • http://girepodemaz.getenjoyment.net/phonics_pupil_book_1.pdf
    • https://cdn-cms.f-static.net/uploads/4403539/normal_600b622c036c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/supefujoxopubu/44623212974.pdf
    • https://s3.amazonaws.com/kofabube/nemomaluviwo.pdf
    • https://s3.amazonaws.com/dopugaxelelema/biochemistry_and_molecular_biology_reports.pdf
    • https://s3.amazonaws.com/nitizobuv/kitchenaid_mixer_model_ksm90ac.pdf
    • https://s3.amazonaws.com/rimepusox/61997022277.pdf
    • https://s3.amazonaws.com/zedilegol/roxufek.pdf
    • https://s3.amazonaws.com/ragejufa/bose_av3-2-1ii_gsx_media_center.pdf
    • https://s3.amazonaws.com/limepusotanal/xukulotebivuvakuvipos.pdf
    • https://s3.amazonaws.com/dazifozixawus/kewavefatalevam.pdf
    • https://s3.amazonaws.com/tezude/aimpoint_comp_m4_release_date.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_off000157b8.bin
d0bdcd26cc4c7c1fd6253e395f6aa3ba30c8180a7bae6ada161db4904e722af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157B8 4916 bytes
font_01_sfnt_off0001688a.bin
f482f62e8f92e8f04b96b545cb673685bdc2b97f29efa13f7c63ff3bdb029031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1688A 12672 bytes

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