Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f69738ad617cd4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 10:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a45220fb42dc95144d89732e147ac8b SHA-1: 4f72e9c8a4fe22b95d4d8daf436f541547532cbd SHA-256: 97f69738ad617cd40944ef9fb65e29bd1c211d007a2db450ac945f6fbd5bf72e
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download and execute a secondary payload. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://manu-transport.com/documents/file/17500204445.pdf
    • https://semangkabiji.com/contents/files/78407398979.pdf
    • http://baiduvpn.com/upload/files/gagarawon.pdf
    • https://fundacjaartfreeart.pl/userfiles/file/27224201222.pdf
    • https://ezokniga.com/uploads/file/83143649297.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/tozefazavu.pdf
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32432286888.pdf
    • https://thefencedocumentary.ca/adminfiles/file/63708393537.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/74681007365.pdf
    • http://problemconsulting.com/img/download/files/zorebutobi.pdf
    • http://ijdssymposium.eu/upload/2023907781.pdf
    • https://sealand-pptc.com/userfiles/file/fifozu.pdf
    • http://ultraljud.nu/bild/files/54784585117.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gugoluxusa.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/86437525075.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/52584918595.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/nudekotomim.pdf
    • http://jpind.pl/userfiles/file/napubimutafuxojexowu.pdf
    • http://adamslakeband.org/userfiles/file/132817598.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/57ugq3s1p48g0kepk5cpl1h4ua/zewixevudagimoditetab.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/pemejejunutab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chal+mera+putt+2+free+online+watch
    • 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_off0000d6f0.bin
b32b2e6d2b04f33bc9d732c419eb58573cc9f3fc6e1eaf50da37e3b869577453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10912 bytes
font_01_sfnt_off0000f01c.bin
48e08f011a1d546039dd1652dd6fb6bcba9313fbfe2b64151ea0eff0afd89952		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17940 bytes
font_02_sfnt_off00011f15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 16792 bytes

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