Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bfa853dc5482e9…

MALICIOUS

PDF

71.6 KB Created: 2021-10-01 06:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 79c63d024dabdb6274358d55ac406690 SHA-1: 62099f281d444f843e05db350b909faecc67fae3 SHA-256: e8bfa853dc5482e9433f4bf4235e4fedc9a32016141ffec7d84b8e51f40dd047
146 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. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a phone number for fraudulent purposes. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites or initiate fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://halead.com/uploadfile/1630847179.pdf In PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/wabebumokutafofitavidu.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/64860985075.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/3013522964.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210924130543.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/gadivipilesaxonejebojix.pdfIn PDF document text
    • http://ipublicity.cz/data/file/gaboderowilubupokofo.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/64489069702.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/vosiwe.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/95557244259.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/lapinapokitoje.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/gipafesaxawebavadufe.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/wazagogujudotavide.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/niranatavujazija.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/13195616177.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/bukepunowo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614804c9bc858---nalonatux.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/xixadekixexikegibufekat.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/losolakadofesinokezi.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/82588156369.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/57557845047.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/soluzifowisesafulo.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/fesekafigiwukox.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/sevix.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/96029257122.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304976964742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=microsoft+office+2007+free+download+crack+full+version+32+bitPDF 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_off0000b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 15060 bytes
SHA-256: 3685c1eab3504340f088290227951d75e3d35fc0d99ee39b890b7d6d06120f92
font_02_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 11412 bytes
SHA-256: 378f35ef770a25cbd797936b9cb908ad9e802a3bbfa9652a343fd0aadccb0a19