Malicious PDF — malware analysis report

Static analysis result for SHA-256 3024b4348a9e2d7a…

MALICIOUS

PDF

63.4 KB Created: 2021-01-20 11:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0aca07c4f4bcb8b02c3fb1ed73a9fd SHA-1: eecf32d84eefd7d4f3dada0444b7aaadff5149d9 SHA-256: 3024b4348a9e2d7a8752e76c206b00686a3116f98c16971b404a300607af9831
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 Weebly and other free hosting services, suggesting a link farm or redirection mechanism. The primary URL, 'https://traffnew.ru/123?utm_term=calculus+10e+textbook+pdf', is presented as a calculus textbook, which is a common lure for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=calculus+10e+textbook+pdf
    • https://zunovuxosuseso.weebly.com/uploads/1/3/4/4/134497136/liruto-xegibevuve-suzolov.pdf
    • http://tubezadobuzaro.66ghz.com/free_business_card_mockup_psd.pdf
    • https://site-1192291.mozfiles.com/files/1192291/81430158690.pdf
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/lewizis.pdf
    • https://site-1225854.mozfiles.com/files/1225854/facilitator_guide_examples.pdf
    • https://cdn.sqhk.co/kitaparek/SyhfBge/sniper_full_movie_2016.pdf
    • https://site-1249145.mozfiles.com/files/1249145/sefazenufadegitemasug.pdf
    • https://cdn.sqhk.co/fisejadiruw/if1Gie3/96067114850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vebogotexaf/96883653885.pdf
    • http://semewefiji.rf.gd/pegajufir.pdf
    • https://s3.amazonaws.com/pogolo/cst_performance_suspension.pdf
    • https://s3.amazonaws.com/gizonukorad/doubles_plus_one_addition_worksheet.pdf
    • https://s3.amazonaws.com/lusabifef/become_tour_guide_in_japan.pdf
    • http://gevorewububew.epizy.com/99213873319.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_off0000bb5b.bin
19fe0b5c90f66f1130acd802ed360eb599951d84261fad8b71860721f163358e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 5424 bytes
font_01_sfnt_off0000cdde.bin
71b9ec1b58fa04ce3a2f37f5e699260454a2b12f89d29b270ccbbed6e4f16f51
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 10360 bytes