Malicious PDF — malware analysis report

Static analysis result for SHA-256 875c4af9706519f2…

MALICIOUS

PDF

82.8 KB Created: 2021-05-15 13:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6ce14b8a53a6fc5e70b1a2a21e4455d9 SHA-1: e58acf3edc9e3a0a115060edb7c394d192640d6b SHA-256: 875c4af9706519f257e68b7ec1bb2497e39c8e435c5ec516872dd2db6810f8c7
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 of which are to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is https://jumiwimov.ru/strik, which is likely used to redirect the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=the+blue+hour+children%2527s+book PDF link annotation
    • http://watercart.ru/12620220107p1g2h.pdfIn PDF document text
    • http://andyhong.blog/964591890204cklp.pdfIn PDF document text
    • http://salestore.pro/sofipanisupeturanizftp.pdfIn PDF document text
    • http://sberbank.services/saperobazikisuvuspa1cc.pdfIn PDF document text
    • http://elerctum.org/learn_cakephp_with_unit_testingavk9z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_0145ab34d085483bac36c5d066c39028.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/nogavafano.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/akira_full_movie_tamilyogi.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/chunkzz_full_movie_hd_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/fafabujorepimanilujef.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/how_much_do_medical_assistants_make_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/gotedokowuwivi.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/what_ink_does_a_canon_mx922_use.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_5f7b2cf9691c47929d89466bbdb22500.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_c67b41d7f2bf4121b2028a4691f730d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piradi/nec_national_electrical_code_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/bose_universal_remote_control_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/chapter_7_market_structures_worksheet_2_answers.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_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 5004 bytes
SHA-256: 879498e175350d256b074faed84d5c75e1e4ffedb84caae192bc18ded02b8215
font_01_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 11368 bytes
SHA-256: 550955b281a1fc13d2ea247d52124c279bae4f26807954d1a921a807a3e357c2

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