Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc311a0d382c01d…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 19:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a190c69e382499a1046d56010fbbfb3 SHA-1: ec17812a1ac97811fb1a86afcdbd3443a0c7f682 SHA-256: 3fc311a0d382c01d8f5147e95977d7c756bc799881988410c052446c03d7940f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further content, likely malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=teas+v+study+manual+free+download
    • https://cdn-cms.f-static.net/uploads/4459914/normal_603c7a0548b7d.pdf
    • http://dommasters.site/rain_bird_5000_plus_manuale_italianoc78su.pdf
    • https://basalusorur.weebly.com/uploads/1/3/4/6/134661810/tenenarafa.pdf
    • http://choosemadam.site/55486700239s4g1e.pdf
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/vurusupexidus.pdf
    • https://cdn-cms.f-static.net/uploads/4425491/normal_600e096789e86.pdf
    • https://cdn.sqhk.co/numiwufeguv/Pjijesl/buvogolamobexa.pdf
    • http://natorg.fun/the_voter_by_chinua_achebe_storyyc7kn.pdf
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/kakugufofijereja.pdf
    • https://cdn.sqhk.co/tijinujul/gd26gi8/sports_stickers_for_whatsapp_2020_summer_games.pdf
    • https://cdn-cms.f-static.net/uploads/4446646/normal_5fe76885655d3.pdf
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/3859448.pdf
    • http://help-violation.com/xikujonubajomibiveniwapoeg0n0.pdf
    • http://betmoy57.com/nanumajuwuzurejexafojujhxn4k.pdf
    • http://rmk4sale.xyz/destination_wedding_invitation_boarding_pass_templatey2kez.pdf
    • http://flymoney.net/617805062323d4dc.pdf
    • https://cdn.sqhk.co/remokuvupen/wRBiggc/15940058003.pdf
    • http://cucoupon.info/pukubimiwesatasiredhab2x.pdf
    • https://cdn.sqhk.co/zinazejoras/ifNDhb8/74206975828.pdf
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/a8778f83625.pdf
    • http://gakmancreatures.ru/xebaresipebanajadosmxdme.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb6ae947-6985-4301-bdb9-b65bbe9a79a3/44559799004.pdf
    • https://uploads.strikinglycdn.com/files/07f1b145-e973-438b-9455-7ccb03bc2dd1/nikamovabulidijoxufadomu.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_off0000f3a1.bin
d42eadb10dcc6bc95ac7a0d35d5e7f3f542d0cedc6653f3e1e734bc535f6f348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5256 bytes
font_01_sfnt_off00010584.bin
78e823d7f8386ea116f0ec35f1c84da4e23acc8e40d24d634f457c5aefb51d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 11452 bytes

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