Malicious PDF — malware analysis report

Static analysis result for SHA-256 85175bebed68eba4…

MALICIOUS

PDF

90.0 KB Created: 2021-03-24 17:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5276cb555e6a5f8b589831b34a5b5768 SHA-1: e318d256dffef5aef72d881c22f54969b10b7526 SHA-256: 85175bebed68eba45fe2870746b85eb3b5ce24fde6ac8ab53f7305b056dee15b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing lures. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'botokaw.ru'. ClamAV also detected this as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=types+of+sound+absorbing+materials+pdf
    • https://cdn.sqhk.co/tubafejog/jejdlqP/15546608798.pdf
    • https://cdn.sqhk.co/mekibekowufe/oifjiih/luden.pdf
    • https://cdn.sqhk.co/xuxovunevo/1jcnjg1/epic_battle_simulator_1_apk_hile.pdf
    • https://cdn.sqhk.co/nezuxada/G4hbhe5/kodibagovaru.pdf
    • https://cdn.sqhk.co/tokofape/rjaj1VY/duginejofudopitode.pdf
    • https://cdn.sqhk.co/dimosiwela/jigiH4v/51771815243.pdf
    • https://cdn.sqhk.co/siripeka/i2hajeL/rock_and_roll_flip_flops.pdf
    • https://cdn.sqhk.co/ramowejub/iieiphf/can_you_mix_two_colors_to_make_red.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_31ec643695f94087aa0ff7f289e1ce60.pdf?index=true
    • https://s3.amazonaws.com/jinabisura/gk_books_free_in_tamil.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_9cd87dd7cd384a40860d57527eba8be5.pdf?index=true
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_05d72683df0245dead0725ed353c68b8.pdf?index=true
    • https://s3.amazonaws.com/wotodedaruzuk/performance_appraisal_meaning.pdf
    • https://s3.amazonaws.com/xidazeze/maximum_ride_manga_10_barnes_and_noble.pdf
    • https://uploads.strikinglycdn.com/files/359f04a7-6bf6-4073-9476-016b9fc6775b/zoparerifunetudave.pdf
    • https://s3.amazonaws.com/jodabiladezot/indian_old_audio_song_free.pdf
    • https://uploads.strikinglycdn.com/files/c2be4b6d-72d0-42aa-980a-17878de4c47b/7728470307.pdf
    • https://s3.amazonaws.com/gedimuta/fizigepu.pdf
    • https://s3.amazonaws.com/kosamupim/bnf_online_free.pdf
    • https://s3.amazonaws.com/jawusawar/yoel_romero_gym.pdf
    • https://s3.amazonaws.com/wixanarer/nuvebibikomanokonewo.pdf
    • https://uploads.strikinglycdn.com/files/3e4ac864-0351-4c6a-b68f-73807ef44c11/yoga_birthday_cards_printable_for_dad.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_46bdedd915ce484d831ceeb897b732de.pdf?index=true
    • https://s3.amazonaws.com/megulu/71621069607.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_off00012168.bin
1aa5a31e0d49d651df136a42f6a829571d24d9c7f9ed5c71e7154d0cf39464fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 5552 bytes
font_01_sfnt_off00013435.bin
44cb41659cfc100da75bf756b1a96dc99de5f2138e6efdaa7136b8f664d09965
pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 11212 bytes