Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b77685da76b936…

MALICIOUS

PDF

82.7 KB Created: 2021-03-20 09:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9a41f1871c4e275d075e43284eefc8fb SHA-1: d9194a7368be361b5366f71b0fe52638345c02c1 SHA-256: 72b77685da76b9369eac6777fba16f3a84da9f077a58561c5f3bd1755b1876e4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to manipulate search engine results or redirect users to harmful content. The ClamAV detection and ML classifier output strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=grade+1+math+3d+shapes+worksheet PDF link annotation
    • https://kanapefa.weebly.com/uploads/1/3/2/7/132740413/08a4c8087e54141.pdfIn PDF document text
    • https://baluwakenina.weebly.com/uploads/1/3/1/4/131437578/47bb0d2058e1a.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/rutiwofojonesonu.pdfIn PDF document text
    • https://jonimewogil.weebly.com/uploads/1/3/1/8/131860125/553608c.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/resume_template_for_freshers_with_photo.pdfIn PDF document text
    • http://merovew.xyz/fizovugajewamaxujateluse0goj6.pdfIn PDF document text
    • http://kitakusiwudaj.22web.org/elizabeth_the_queen_sally_bedell_smith.pdfIn PDF document text
    • http://lofitner.buzz/the_encyclopedia_of_country_living_10th_edition99gzu.pdfIn PDF document text
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/nasidarotikid.pdfIn PDF document text
    • http://samekado.22web.org/vibipufomadepafoto.pdfIn PDF document text
    • http://biolinkus.me/cold_cases_investigation_mod_apk5bkv5.pdfIn PDF document text
    • http://servisvds.ru/794196426031fw84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finubovuputok.epizy.com/lolukiduxemim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40f41b2-c7e0-4b81-93f6-3cc62ffe7b54/56399538415.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/the_help_kathryn_stockett.pdfIn PDF document text
    • http://mawarine.epizy.com/3d_chess_games_vs_computer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/sig_p238_review_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/what_episode_of_vampire_diaries_does_elena_and_damon_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/words_followed_by_appropriate_preposition.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/3d_artist_cv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0e13fe-40fd-4944-a750-69561fcbab01/how_do_you_determine_the_strength_of_intermolecular_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af07d4ca-4ec2-41a6-b942-862b7353312c/46803107150.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/beyblade_game_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d38cb7-5be1-47f4-b557-1d145feb94ee/vefaxabilalawawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ec26c6-89bf-4b47-9e2e-1cc8cd75319e/gexaluxelugifo.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/surgery_prophylaxis_antibiotic_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/new_army_uniform_release_date.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 5568 bytes
SHA-256: c5f20aa9328013fa3f479205535e1200dc98f1ae486223323918cc25520362ca
font_01_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 10508 bytes
SHA-256: 41ae1c9d4fe25d6977398c1a8d23b586f6b1eaa717c933ef9dce31e993de82ab