Malicious PDF — malware analysis report

Static analysis result for SHA-256 139d5a9a6552535f…

MALICIOUS

PDF

81.5 KB Created: 2021-03-13 23:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 34272738605648bafba7bf31d0e4361c SHA-1: b20448a6d91b5ffe14302ac784e56b715cc8712a SHA-256: 139d5a9a6552535f2a7d8c0e3822ab90dd8aa19a7e81152684a9c946809df326
136 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The document contains a lure for free games which redirects to the URL https://nipisod.ru/123?utm_term=ben+10+offline+games+free. The presence of PDF_SEO_UTM_REDIRECTOR_LINK heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/123?utm_term=ben+10+offline+games+free PDF link annotation
    • https://cdn.sqhk.co/fagiseregu/2SFcWhd/milk_chocolate_frosting_with_chocolate_chips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_601b3990d114d.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/BjcgdxL/youtube_video_downloader_for_pc_free.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/xadimu-kemenokuf-nofopulidag-gogejilup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_60256ca03904e.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/lPNIgdK/football_heroes_collection_books.pdfIn PDF document text
    • https://gapepaweduli.weebly.com/uploads/1/3/5/4/135400658/wewedov.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/uieGhjf/sound_tuner_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5ff2c659429e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_604a64a6827f4.pdfIn PDF document text
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/7358670.pdfIn PDF document text
    • https://cdn.sqhk.co/tarozawowe/iahdgik/police_cars_ambulances_and_fire_engines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454665/normal_5fee11c2283d8.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/vSj6haW/ninja_air_fryer_toaster_oven_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/iacjjen/nelipikakane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/motorola_sb6121_comcast_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/mazukiwawis.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/sawenadivudewadijigil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 5328 bytes
SHA-256: 6c7b4b633384793c49a406e6064661e338d9b629905a3b62481c168c1ef6603a
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 10676 bytes
SHA-256: 8512c4ada7e6285b518e441a36a392234332278183d497512443d740381ed97f