Malicious PDF — malware analysis report

Static analysis result for SHA-256 7133d6968306e7b7…

MALICIOUS

PDF

81.5 KB Created: 2021-10-24 00:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f91b16d4a4ddd31b62cba372f829a1f1 SHA-1: 8f2411b9ace308493249ea850971c1e1b918d037 SHA-256: 7133d6968306e7b7c015cfda70cfe7c6fd5e63236c948521d8c8f526ecf95e50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://garglob.ru/uplcv?utm_term=acid+base+titrations+ap+chemistry+lab+6+answers PDF link annotation
    • http://kamakuralosgatos.com/uploads/files/49807013382.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/289216e50d35d671dfeb5a3ba87709fc/22036081502.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/75150760759.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/derajusujukidazuxaxives.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/vorijitegidaxujavotino.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/wudivejudeji.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/puwazetujukisadebumegoze.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/nupixegipagugun.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/pumilumovenatafefolesen.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/163680436.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/49032391688.pdfIn PDF document text
    • http://runhouchem.com/upload/files/25662929923.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/piwavolagaduzolasom.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/goxevikuzifivelujigili.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/fukigovizunipom.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/milizopimifanurumeme.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/remuxiva.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/93229178793.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/rotiwamizemufigifoda.pdfIn PDF document text
    • http://slotpt2.com/contents/files/dagivulopin.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/manerepefobisiwuralama.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/20760888081.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/gadasalok.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/rijavizozesovaxopajoxaf.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://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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 11268 bytes
SHA-256: 47034bf9a0e482c6635fc044f9d88cbef333a938d46f6dea5795b7bbc59ad3e5
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 16336 bytes
SHA-256: 1025e092cb56b7961e5033620f6f8e1b94faf2c364ef1550a12acf20c49c95c4