Malicious PDF — malware analysis report

Static analysis result for SHA-256 346434c261121fb0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 15:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f8360dcdd1dad82f2de74411a918cad SHA-1: 1d9420c00e191c873e51f77ccfa601ef48250533 SHA-256: 346434c261121fb01c315aa466eab22c4e87f2fbfc82475ec6a6027cfdafad98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of a disposable link farm heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://muasamhangmy.com/ckfinder/userfiles/files/fokibaredezug.pdf In PDF document text
    • http://thermcom.cz/userfiles/file/vadumoxerisagaji.pdfIn PDF document text
    • https://successalpha.team/upload/files/55738012777.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/wokujogaponif.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905061209248.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/pidupot.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/78959980462.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/bowaxijusosogamelel.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/livapujane.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/83871140345.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/jememijexenubedidovebo.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/32645393432.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f382ec8a34---34926514045.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210913175616_6fvr0b.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/20609878516131882a7f22f.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/82262029289.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/vewage.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7745ecba5a12b8c95b7a6642860ce083/jojoma.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/68772541174.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/xirojatoge.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/55096814161.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/guzenametiditososuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vmx+video+editor+mod+apk+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 10700 bytes
SHA-256: 84b9655f12d629276efc54537b00aff145e8948b0af56ee45e30aeab93989e83
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 20448 bytes
SHA-256: 9c505cf6e678b52e8e70eb97fbd33ea14cb297a52002df3c3db7af8fe48207f8

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