Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57a92afde6dd8f7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 17:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d8f314054ff7ac1c64c55aaba012045 SHA-1: ea255b87a25cebb4d6c8b57dd5f6de86b5b81809 SHA-256: b57a92afde6dd8f714a31fe82b33a3d506051117bd7de66e9546000c89acd8df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://kalashad.com/userfiles/file/16157303437.pdf In PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/55155972276.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/16788964178.pdfIn PDF document text
    • http://aven.su/userfiles/file/favatirotetex.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/25402519881.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/dixavabunorojodoporizoxil.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/lazuriwiwigirirujukekiju.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/sawowunikovofer.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/11819146290.pdfIn PDF document text
    • https://signika.pl/Upload/file/82961622656.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/sokeruwitesex.pdfIn PDF document text
    • https://digireg.ru/upload/rimomurinepefojape.pdfIn PDF document text
    • http://benetalent.com/upload/files/merenokaretan.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/xunuwo.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/56490793459.pdfIn PDF document text
    • http://cutskytools.com/d/files/lopazu.pdfIn PDF document text
    • http://neuroxl.com/images/file/bexosiveme.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/51541ae73ebc83bad7b29aa897d4655b/70400616228.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/67306823810.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/veziwiwibekovafa.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/77579467278.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zazarabebi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/popesefan.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/71732155271.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/sulixokewexagubivewagogiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=4liker+pro+fbPDF 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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 22828 bytes
SHA-256: f294d1de2a683dfe4a9afe779409340be7ff7fb269d6b02c02f7175b5f563d34
font_01_sfnt_off00010a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 10032 bytes
SHA-256: db691b918c5477e7b79bbd36ac54a9bc28d77493a5e40152b2fd121c0c061696