Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf755a05fc0c70a6…

MALICIOUS

PDF

73.5 KB Created: 2021-03-11 09:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 468366a02b46b5fe2fe6dc0be0d6317e SHA-1: 4957e7685bc4e5bbed87b68ec71f3258387a2396 SHA-256: cf755a05fc0c70a6e04cecbe2590754b49bb5380f947e2bf4568b5e164a0c462
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL and the heuristic for a download button suggest a phishing attempt to trick the user into downloading an application. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=cloud+tv+apk+for+firestick
    • https://static.s123-cdn-static.com/uploads/4446263/normal_5ff05e2fe21a9.pdf
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/964468.pdf
    • https://cdn.sqhk.co/ketusugedi/yfQiiij/video_player_for_windows_8._1_64_bit.pdf
    • https://vidowenabep.weebly.com/uploads/1/3/5/3/135322196/nojunupunodud_wirelem_govizovox_filotezed.pdf
    • https://cdn.sqhk.co/balaragu/ghbhhij/bonukogavure.pdf
    • https://static.s123-cdn-static.com/uploads/4386089/normal_6003cfb60b41d.pdf
    • http://livunopewopo.iblogger.org/calcio_in_diretta_tv.pdf
    • http://raguvigawak.mypressonline.com/dizen.pdf
    • http://buwubaled.mywebcommunity.org/bemuduzinoganorejanu.pdf
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/848823.pdf
    • http://beruvutekimeged.22web.org/audio_from_website_python.pdf
    • https://cdn.sqhk.co/pigevikuwi/gegfJii/jexotadubotulofukewuka.pdf
    • https://cdn.sqhk.co/xewafazuk/qj3dggA/word_cookies_cheats_halloween_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5fd2a6e82bf42.pdf
    • https://cdn.sqhk.co/nepajenine/NCgfhd1/sell_on_etsy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rewezaxow.epizy.com/autodesk_3ds_max_2011.pdf
    • http://kesuleruvepo.rf.gd/31530644236.pdf
    • http://vubelifijam.atwebpages.com/how_to_make_a_claim_on_usps_insurance.pdf
    • http://fixelelediv.epizy.com/is_there_a_portable_ac_without_a_hose.pdf
    • http://rinonefor.rf.gd/adjectives_exercises_with_answers.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_off0000e46d.bin
a54774e784352ef6b6a9b1e515c8a2664b655160e9b274f15a25ac2267ef5ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 5176 bytes
font_01_sfnt_off0000f621.bin
be5e098edaef492a8f3a278139b469498e54a9a14cb72ba844af0a4db2c55674
pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 10164 bytes