Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a97fad29e3b894…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 048da53c5920721b5bb3338e840dd393 SHA-1: 8eb542e65ec815b8d2a08280a23b22d1ab8024fb SHA-256: 01a97fad29e3b894ee7b91ee31f2a72239b506b945090de86968d7627305fa73
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of a phishing or malicious redirection attempt. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

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://leonvi.ru/wix?keyword=how+do+you+say+you%2527re+beautiful+in+spanish
    • http://pollsexpert.com/ps4_racing_games_that_use_steering_wheeli2c0l.pdf
    • https://nivosuvadifo.weebly.com/uploads/1/3/5/3/135384950/sukuzo_jafisisavuwu_zugajodadava.pdf
    • http://nituzovido.getenjoyment.net/46761544918.pdf
    • http://nemosixumeki.mypressonline.com/parabody_350_workout_chart.pdf
    • https://zelopira.weebly.com/uploads/1/3/5/9/135990333/jaxisufos.pdf
    • https://cdn.sqhk.co/nowonipewo/ccha6ha/zebra_crossing_meaning_in_telugu.pdf
    • http://habercigo.com/autocad_civil_3d_tutorial9jzul.pdf
    • https://cdn.sqhk.co/taxuvoguraji/hCzjchj/6104456088.pdf
    • http://chelamela.org/wonuddkovp.pdf
    • https://dimofusuraz.weebly.com/uploads/1/3/4/6/134677966/mojipisivexa_mosaduporojaser_ralosizatirexu_vedeze.pdf
    • http://hargotel.xyz/how_to_remove_a_stuck_tape_from_vcr3x3u9.pdf
    • http://tk-time.site/papuwuvebufigelumeavb0u.pdf
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/xipikomuxapabid.pdf
    • https://favobilumosuxo.weebly.com/uploads/1/3/4/7/134733594/27e1128c06f.pdf
    • https://cdn.sqhk.co/mozoposowi/exijkHm/bubble_bobble_hero_2_game_online.pdf
    • https://cdn.sqhk.co/wirowanorax/ahbgdoh/paper_and_more_oklahoma_city.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_4bba2e4fb5cc481699db0e87dc1d7331.pdf?index=true
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_0687bee6d1b945398e98a2d8a0d92b52.pdf?index=true
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_521bc8ad5faf4a41ad8358233b022d9c.pdf?index=true
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_704a3ecd422a412181a12be358b71b9d.pdf?index=true
    • 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_off0000f03e.bin
20372dff09e397fa989503427df97b46657f653992e43057f17230a9949b3ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 5460 bytes
font_01_sfnt_off000102da.bin
938be066a8acbbedc8ce9486f20c5f6556f537715d260b90560e144e29f29a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 11252 bytes

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