Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19b42d5f975677c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 16:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28a587743716a9d460bf668837daa8ed SHA-1: fafa85c5ace81fefde826765ef1ca1e8a018bfb0 SHA-256: b19b42d5f975677c1a3898e8b579b606a6a28c6c37c0786d9246697800ae1a47
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one pointing to a raw IP address, suggests an attempt to redirect the user to a malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed as a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://amursvoidom.ru/media/files/medabopiwakivaj.pdf In PDF document text
    • http://s4l.vn/storage/ckfinder/files/22876140968.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac41911bb---12213732958.pdfIn PDF document text
    • http://baove24h.info/upload/files/gexelevurakujurewoda.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jarogegugumu.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/tezemukefakemogusoboz.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zodobuminoxizejetunazi.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/50757273566.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/digekidilizurizejimam.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/sipadazatavujenerosol.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/9520880733.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/8511776483.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7350ba1b6756146518e0f4371a7336d0/suzajup.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/sonoseguduzasek.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/fufikuxo.pdfIn PDF document text
    • http://exim5.hu/_user/file/divisa.pdfIn PDF document text
    • http://iviltra.lt/images/files/zomefafagibipanewur.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/fuvesuduburakepekidise.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/9639018474.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec3b573e3---80652997274.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/80728317601.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161308cd9d174d---69609452472.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=live+now+chromecastPDF 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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 10560 bytes
SHA-256: 569e3ebe7c7ccb73551d5e2d6c0fd2d8551433f61e5ae23887bedb5eb5d22381
font_02_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 18672 bytes
SHA-256: 56d299bf762534760b91ae77d727406f76bdf6d4e2a276e0a86eca2337461337