Malicious PDF — malware analysis report

Static analysis result for SHA-256 140a2e1debccf89d…

MALICIOUS

PDF

80.6 KB Created: 2021-03-30 17:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10725b253662c97f7a3fd376d88a9985 SHA-1: 72bddfb6937e8c9b9d7b0a6de499c17db6826562 SHA-256: 140a2e1debccf89db76d3bec3c20f44cb6e76b06bbd283262dd2a48b9a709912
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are part of a link farm designed to manipulate search engine results. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=affairscloud+current+affairs+pdf+june+2020
    • https://cdn.sqhk.co/lipebefaje/Ogfghid/assoluto_racing_2._1._4_mod_apk.pdf
    • https://raxokada.weebly.com/uploads/1/3/1/4/131409035/lopol-vezux-fubibijexub-lexafupebaku.pdf
    • https://xizenajagixofus.weebly.com/uploads/1/3/4/6/134657686/fapanirawiso.pdf
    • https://cdn.sqhk.co/vuwewiwudesi/gigfhbj/farming_ionized_minnow.pdf
    • https://sikukaposarimi.weebly.com/uploads/1/3/5/3/135307882/e4dfcb.pdf
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/neserunafu_ruwowokore_fogijosogov.pdf
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/xusifurefesekosunomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_046184ab5d6540338cbe19a13eb1e6e5.pdf?index=true
    • https://s3.amazonaws.com/lowuwofuxali/watch_kannada_movies_online_free.pdf
    • https://uploads.strikinglycdn.com/files/6fe6b71c-4ed9-4900-afe3-d63efa596f28/fejadivofajul.pdf
    • https://s3.amazonaws.com/zowejunef/printable_coloring_sheets_for_preschoolers.pdf
    • https://uploads.strikinglycdn.com/files/eb64067f-2e83-4657-94d4-40e0a349ff63/how_to_convert_leaf_hog_to_blower.pdf
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_58f9020235f34708b7c634f4ac74053d.pdf?index=true
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_96cb9d9fd08c4621949167ee6f7e8db1.pdf?index=true
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_31e163ba819646cfabe6e51fdf576b73.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c43703d-8432-46db-a4d9-c3b6b1abf5ff/why_does_my_top_loader_washer_smell.pdf
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_f152be17ad9844e4be7684cf39605fb1.pdf?index=true
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_a72d7c5fff4d497d91e6f8a75740afdf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/179bd029-fdd2-4c95-ada0-187974b99a36/50722729396.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_3c6994308f4c4cdb940555970207b1b9.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_094e34836917459fbebf2d298372a598.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_off0000f9fc.bin
010292ba9a5b9023b11551495bf2d25304bbf460605c3d282d8c5ad55575bf7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 5488 bytes
font_01_sfnt_off00010cbf.bin
9fb36a1c99ad6cbbff438630f72d6bb51b8de40179ac6c61a3ae6ae7ec1cfb7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 11232 bytes

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