Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d5d956a1d29904…

MALICIOUS

PDF

100.1 KB Created: 2021-03-20 00:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8519e17e1a7a007eb50a7fd953d2d235 SHA-1: 457ff7e0869f73de6982f97dcc363221c4853b61 SHA-256: c9d5d956a1d299047b1a556f03e35d8751de48e2a37ba2095c0ea36b76a56deb
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to suspicious domains, indicating a potential link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=friendly+letter+format+in+malayalam
    • http://sluzhba1.net/41164497879xgag.pdf
    • https://cdn.sqhk.co/puvegipuros/haNhceE/85615711340.pdf
    • https://cdn.sqhk.co/vafegijateno/jajjhjc/modern_sofa_table_lamps.pdf
    • http://aromaita.space/82502942746d4sb5.pdf
    • http://summer-italy.fun/ctecs_workplace_readiness_skills_test_answersr07cw.pdf
    • http://ludshop.xyz/69287976358gxmip.pdf
    • https://cdn.sqhk.co/tibidimewako/dEigjou/71349825191.pdf
    • http://khanapoorti.com/bekaborepalebv6ac.pdf
    • http://kefets.xyz/no_easy_day_movie_castkhquw.pdf
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/popamunitem-vubirezekovezij.pdf
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/87e6829bacc61e9.pdf
    • http://tehnotop.space/cvor_test_questions_and_answers_ontarioa5mbg.pdf
    • https://cdn.sqhk.co/ruzemesafe/h0gdgdO/58943128262.pdf
    • https://cdn.sqhk.co/tezofugowura/ibsifhi/snapchat_emoji_smiley_face_with_pink_cheeks.pdf
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/dukale.pdf
    • https://cdn.sqhk.co/kitujesijak/h1qoMp8/55853790108.pdf
    • http://kvrovk.xyz/75879795806islfi.pdf
    • https://jafekubu.weebly.com/uploads/1/3/0/8/130814731/puzodijewezoj.pdf
    • http://slamelina.website/grays_anatomy_reviewgp2w8.pdf
    • https://cdn.sqhk.co/bitomasijelo/ijcjfha/need_for_racing_fever_mod_apk.pdf
    • https://cdn.sqhk.co/sigagegijej/jKxXwgf/91071511745.pdf
    • https://cdn.sqhk.co/fasazani/tjjhfhd/zaxajewosod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://zufonokimilije.epizy.com/sapelokiwidubi.pdf
    • http://ripeterub.epizy.com/17441835037.pdf
    • http://datidalumoz.rf.gd/bsc_modern_physics_notes.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
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120cf.bin
16538f0af9dd87122e19cc2d40be5419d3510211bd375287e3b604b17f6c102d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 4932 bytes
font_01_sfnt_off00013180.bin
d14edade79350314cb8ada7e30be2abd1b2f0a892fb07cbb68a9e912530b3541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 11844 bytes
font_02_sfnt_off0001577c.bin
e26a95dc320ce0c046f42f59d75baf88ad7a62b472b75dc2774af847de7f59b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1577C 12364 bytes

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