Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e12c1f0e31888f4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 12:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48a400b9bbef61505cb2c9ff1a2a3436 SHA-1: e5ff529d7027655b92200555c0b334ea7a373c57 SHA-256: 1e12c1f0e31888f443e7d34cb71b3aaee8975577e05766b755fc28c06776b553
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended for callback phishing or a tech-support scam. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML detection suggest it may leverage embedded JavaScript or other exploits to facilitate its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=android+institute+in+pune
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bopizadujokiduta.pdf
    • https://jss-moms.si/upload/File/wimesop.pdf
    • https://beaszemin.com/files/30422570279.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cddecefcfcf08037fc079cabf12f324d/wixumaden.pdf
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/sawin.pdf
    • http://bkht.vn/userfiles/file/98902434604.pdf
    • http://888spirits.com/userfiles/file/midekurukiwomino.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109141844194383.pdf
    • http://miyagi.chi-kara.net/Upload/files/tubakanoziralufogivem.pdf
    • http://dzirerealtors.com/uploads/70887730190.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/ragemixafugu.pdf
    • http://azizolace.cz/images/file/54149146407.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/ribosegi.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/xutibewisinixaranek.pdf
    • http://german-ex.com/images/blog/file/78370272665.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/11001499159.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/32662196732.pdf
    • https://299-45.com/CKEdit/upload/files/jatixeliwog.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210912_E7552E8D920EE68A.pdf
    • http://shahgrp.com/uploads/pobef.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/ribopifu.pdf
    • http://onlineticketreview.com/images/file/watasoje.pdf
    • http://peak-experience-japan.com/images/blog/file/tosiriwitajewosok.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/72670401572.pdf
    • http://asja.ua/userfiles/file/50572344903.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95d.bin
ab26e536dd82915a187738603a33ef28bcb5c24132ce7b167285daecd78d4940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 17616 bytes
font_01_sfnt_off00010784.bin
0c81e1a7e5e176f79226384b68c39b60476fdbeef89a43432a1a6e3b417acc81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 10256 bytes
font_02_sfnt_off00011eb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 16792 bytes

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