Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab668cad583f6fb…

MALICIOUS

PDF

84.7 KB Created: 2021-03-15 19:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f5c4f4f6736a3b3b30927fc30302c4 SHA-1: 72c37b6452ea4c4b71562a65c3a8a66f340161b4 SHA-256: 9ab668cad583f6fb8874776c8a59f0814348962ec978362c03626b98b1e9b1c9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm or SEO spamming technique. The primary URL, 'https://seumenha.ru/strik?utm_term=making+significant+progress+meaning', suggests a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, likely phishing or a trojan.

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://seumenha.ru/strik?utm_term=making+significant+progress+meaning
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5fdc5b1164f52.pdf
    • https://cdn.sqhk.co/dasofuduveje/hhijfko/dujezubopunewibibile.pdf
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/8b75834b2f7e.pdf
    • https://cdn.sqhk.co/sovixojer/gfHvjcZ/sputnik_movie_trailer_english.pdf
    • https://bunavomotuta.weebly.com/uploads/1/3/4/6/134606544/goripa.pdf
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/vamifekoxinaluduro.pdf
    • https://cdn.sqhk.co/fabokofe/jiicii4/outfoxed_idiom_meaning.pdf
    • https://cdn.sqhk.co/lemijexo/SjbHzii/poached_egg_maker_how_to_use.pdf
    • https://cdn.sqhk.co/xorunase/ihbjerX/91677319414.pdf
    • https://cdn-cms.f-static.net/uploads/4388825/normal_602bad72f2267.pdf
    • https://cdn-cms.f-static.net/uploads/4373264/normal_60175f3f6f437.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bidemewufa/mosilebomibebetitomawis.pdf
    • https://s3.amazonaws.com/lomogas/fomatimabexenogoza.pdf
    • https://s3.amazonaws.com/nitatotol/6456577729.pdf
    • https://s3.amazonaws.com/falufusu/age_of_empires_2_online_guide.pdf
    • https://s3.amazonaws.com/jemisajoda/pejikubab.pdf
    • https://uploads.strikinglycdn.com/files/ff95ef28-9bc7-4702-a551-7772a6d92122/jezagosapijumefe.pdf
    • https://uploads.strikinglycdn.com/files/49625085-7b34-4b71-bf32-fb80e543b565/16109741596.pdf
    • https://uploads.strikinglycdn.com/files/e6f6265a-941c-4f84-b7e2-f6859efd6d7e/polukisupomuxow.pdf
    • https://s3.amazonaws.com/xidazeze/redabigikozumikodekopex.pdf
    • https://s3.amazonaws.com/xonaxevetaf/beamng_drive_online_game_no_unblocked.pdf
    • https://s3.amazonaws.com/bamepofewalada/minecraft_free_trial_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/91b23a0e-8da7-4ab2-9548-0019473b3423/peavey_vypyr_30w_pedal.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
    • 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_off0000f32f.bin
1ae6836fcae209bdc0fb8e9c670ae8641874daf8d641765176267c2f5c6946d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 5372 bytes
font_01_sfnt_off0001057e.bin
eb4332e0334cbe460f8aa8cd0ce1c4a3a0c7be6469b2fc3e4c27290154261532
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 12432 bytes
font_02_sfnt_off00012f36.bin
3fdbcdcd542c1aeb3e3cb656fe2105df285dc7d4491f4f9e62c05407a4f61820
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 16268 bytes