Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0299109bdb23726…

MALICIOUS

PDF

71.7 KB Created: 2021-06-03 17:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dcaae23ea795ce40fdcd0ccffeab6ba SHA-1: 75c6f9c9ce232aee88ddfbb8609239cec4a2eb54 SHA-256: f0299109bdb23726bb88e6891d2d4c7ef040de845aaf07a0afe32c978cb01ebd
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 high likelihood of malicious intent. The PDF contains a large number of external links, characteristic of a link farm designed to direct users to potentially harmful content or phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this is a distribution mechanism for further malicious payloads or scams.

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-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://krisoc.ru/pbw?utm_term=generative+adversarial+networks+with+python+pdf+download
    • https://static.s123-cdn-static.com/uploads/4495696/normal_5fcb1e42983de.pdf
    • https://static.s123-cdn-static.com/uploads/4489247/normal_5fec04819e982.pdf
    • https://cdn-cms.f-static.net/uploads/4421201/normal_604b1c42eeb39.pdf
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/tevimatawulotoma.pdf
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/f5d4536d38a288.pdf
    • https://static.s123-cdn-static-d.com/uploads/4485318/normal_60b6c6532e25a.pdf
    • https://zefowuji.weebly.com/uploads/1/3/4/0/134096403/fituxininuzotut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zabodovojif.pbworks.com/w/file/fetch/144426150/xomoki.pdf
    • https://uploads.strikinglycdn.com/files/8b510ecd-3957-4a01-8e7e-1e84c0e686fd/skillshare_free_trial_3_months_code.pdf
    • https://uploads.strikinglycdn.com/files/40e072e1-edf0-4fbe-bba9-fa984c088af2/fepigaguwiwarozalajupaw.pdf
    • https://uploads.strikinglycdn.com/files/0b962bec-2767-42cb-869e-dc3dfa674453/74969014090.pdf
    • https://uploads.strikinglycdn.com/files/5e844603-5a25-4632-ad37-7a048ff8f029/buvadixigivusarulara.pdf
    • https://uploads.strikinglycdn.com/files/b707c5aa-1040-4b93-9910-61f6c23c4ad9/how_much_does_a_manager_at_great_clips_make.pdf
    • http://zuvevetub.pbworks.com/w/file/fetch/144421668/zitejedo.pdf
    • https://uploads.strikinglycdn.com/files/b2e98402-74a7-4325-b25c-db65d705b0fb/dd_3.5_warlock_handbook.pdf
    • http://rorazokazog.pbworks.com/w/file/fetch/144503241/unblocked_games_77_fortnite.pdf
    • https://uploads.strikinglycdn.com/files/20192164-0c70-46f4-aed7-92ae3970d454/sens_propre_sens_figur_ce1_bout_de_gomme.pdf
    • https://uploads.strikinglycdn.com/files/f703acf7-bf60-473c-adca-7d5ed5947d74/butuguverovajiwi.pdf
    • https://uploads.strikinglycdn.com/files/95ba3393-0aa6-49ae-8794-14d1c4b2fbae/how_to_find_fgx_calculator.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_off0000d703.bin
d7e20bcf7cbfff585862369a77fe9ce36a3e81057c53d6ce1fac7f76f515edc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 5480 bytes
font_01_sfnt_off0000e9be.bin
23c940889abbdf10a015661f2f257c7a749fe5b6981665b86b537459841a996e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 11672 bytes

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