Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a027670e43e27a…

MALICIOUS

PDF

88.9 KB Created: 2021-03-30 20:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50821a3fea790473b4b626812cad540 SHA-1: 9e3d53a1aa783f5e78fbbb22283591f631241143 SHA-256: a5a027670e43e27a95f0d292caad8863a4ad0645bb7333c9519189d52037e803
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate content, such as download links for 'grand theft auto 5 apk file'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or malware distribution. The presence of external URIs and a large number of linked PDFs suggests an attempt to redirect users to malicious sites.

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-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://vilenefex.ru/wix?keyword=grand+theft+auto+5+apk+file
    • http://tendernes.ru/34292832931oae6h.pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/2746671.pdf
    • http://voicebftyi.com/197709408143oaud.pdf
    • https://cdn.sqhk.co/kimorotadopo/Lghhijj/green_papaya_salad_recipe_vegan.pdf
    • https://cdn.sqhk.co/fejisedetu/34g8Upo/subway_runner_endless_rush_running_time.pdf
    • https://dibufasefeduvit.weebly.com/uploads/1/3/5/9/135975636/7824970.pdf
    • http://mamajan.space/71110366556a50cb.pdf
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/2890106.pdf
    • http://brumbum6.xyz/49456620019xk6ga.pdf
    • http://euroshopme.site/symbol_ls4278_wireless_bluetooth_barcode_scanner9a847.pdf
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/360fd4.pdf
    • https://cdn.sqhk.co/fixuzigetir/l4Miidz/1308776828.pdf
    • http://ins.expert/shopping_near_chatuchak_market5o1s2.pdf
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/4ac451a8.pdf
    • https://cdn.sqhk.co/vakolitakap/hijOfwO/9416523114.pdf
    • http://hs-life.ru/kyocera_ecosys_m5526cdw_manualemjvow.pdf
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/5298099.pdf
    • https://cdn.sqhk.co/bebetirifam/2jachaa/57597151588.pdf
    • http://hellochildren.online/giwulesuniwozekapobrcfkk.pdf
    • https://cdn.sqhk.co/fiwujumejuf/cievibD/correct_score_betting_tips_daily_apk.pdf
    • https://cdn.sqhk.co/todiwapubu/iaRQAgc/account_example_balance_sheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b0.bin
64a9136d15ecbd8afca56d50c1d64b7ead14bfda603006ffae7b02f0096ff396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 5168 bytes
font_01_sfnt_off00011848.bin
00ec59a26792aba7b7603cae5a7a5430dd60fe7f916977fe2761526a849dd292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 11364 bytes
font_02_sfnt_off00013f61.bin
107dd7461bad0ee7f69ec232d7edbfa51533cbe03462e0930b0bd999c9024e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 16152 bytes

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