Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddc0d6c1f65118d…

MALICIOUS

PDF

66.8 KB Created: 2021-09-25 00:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dbe4c680a766df0cd8818490ccf09ad4 SHA-1: 0ba04301099968a372918b0c5f0df1dd8165f7ec SHA-256: 9ddc0d6c1f65118d2b409a9ffd8b168425082b95ee8883da3670c4e1e64f07aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://netdepphunu.vn/images/userfiles/file/zitidebemisalonusugod.pdf In PDF document text
    • http://straub-online.ch/userfiles/files/70599223356.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/88145314912.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/40420839713.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/43867821021.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/gejilaxarizizu.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/duromapexikutigunofi.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/wanibujab.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/70050315179.pdfIn PDF document text
    • https://wittnebel.dk/file/duxereregopog.pdfIn PDF document text
    • http://renknh.com/ckupload/files/tenefaxagegogadezefasup.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/jarobuw.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/60589361030.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/vuduvafapetojafobujuginuw.pdfIn PDF document text
    • http://jsdarvin.com/files/30814735633.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/vapegibezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=aos+tv+freePDF 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_off0000a69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA69B 9852 bytes
SHA-256: e1da438c81fa5b395d7f2f304102f5d8352294447329deacf5f081ad66b76f7d
font_01_sfnt_off0000bc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC76 16496 bytes
SHA-256: e38bc77bbb9f7c6eb42f8f32b987b9903c2541bfa777d2c39e4ab445f359dcd1
font_02_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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