Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d78ffbd61e28f5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-22 09:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f99893532b1ad227ba6499db5bef305 SHA-1: 10e17bf16f4194241944d753c2c69c0f9d0bfad7 SHA-256: 42d78ffbd61e28f575cf7159e3ecb7467ab57d0e393c3491f28b079154f6bde4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of embedded JavaScript and external URIs suggests an attempt to exploit vulnerabilities or redirect the user. The 'SE_CALLBACK_LURE' heuristic strongly indicates a social engineering tactic to trick the user into calling a fraudulent number, likely for a tech support scam or a similar pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://charming-dc.com/uploads/files/202109092009135206.pdf
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/lijetebolikofozubun.pdf
    • https://ksboutlet.com/file/files/nixele.pdf
    • https://kvzriu.org/images/file/faniv.pdf
    • http://kingsauto-bar.com/js/upload/files/86622348051.pdf
    • http://5m-tti.com/uploads/image/files/pafugapetoxogokavuxiv.pdf
    • https://maymac.info/userfiles/file/sewomuzimusisuribonaji.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/92419314428.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/dabedibuseba.pdf
    • http://droneducational.com/admin/userfiles/file/fivixumuruxuzinesova.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2b1c82abe6964998dbdb959faa528d03/9963432344.pdf
    • http://w3-japan.com/js/upload/files/vetixolanutetixaguximon.pdf
    • http://ediliziaunoaventi.com/userfiles/files/82438400797.pdf
    • http://riviera.az/userfiles/file/zazubofuxabomeg.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/bibedizaxusegibiteda.pdf
    • http://epilia.com/upload/FCKEditorfile/lidogalunamel.pdf
    • http://bajajsports.com/userfiles/file/latejezunirulalakudip.pdf
    • https://synodradomski.pl/userfiles/file/78641383423.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/jebexatij.pdf
    • http://agavietnam.com/img/files/mijemofelodenavoravemiso.pdf
    • http://gayaarchi.com/userfiles/file/20210921052412.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+icloud+password+with+phone+number
    • http://abcs.umontreal.ca/upload/files/34430753682.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_off0000bcb2.bin
6a44efb010aab7557e08ffb9c9fb48fbb1f6c8e0384316a05ffa49b066f5a17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB2 16260 bytes
font_01_sfnt_off0000e6f5.bin
1c61c62091cd36e922ce1f63ec940be3f865cc1b615a862ce667e5b4053b5652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 11096 bytes
font_02_sfnt_off00010070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes

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