Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf697fcd0b166c1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 19:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73cb46b04b9fa9704cab274f302acb00 SHA-1: 21445998697e8ee8416b87b4779df91c560a4be7 SHA-256: 2bf697fcd0b166c177fafbb0e8f9b6b49ee4d5bd2126c876d83b1a73e0d6ae4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to distinct domains, characteristic of a link farm. One heuristic specifically identified it as a link farm on disposable hosting, with a UTM term redirector, suggesting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://sms-dk.com/FileData/ckfinder/files/20210905_34B53A427EEFCC68.pdf
    • https://ms2gacor.com/contents/files/99745179906.pdf
    • https://cosmetic.dilen.top/upload/files/defoges.pdf
    • https://tidurmalam.com/contents/files/sabezitekesugolej.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/29964760179.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/16650086983.pdf
    • https://uudanbury.life/files/file/59416384072.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/53519850413.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/81139705509.pdf
    • http://aviafond.ru/userfiles/file/77359928216.pdf
    • http://mylead-journey.mandiricareer.net/contents/files/sogifukanabewuwuwisuji.pdf
    • http://gamax-moto.cz/data/dokumenty/28577689306.pdf
    • https://mgrenginiai.lt/ckfinder/userfiles/files/54006927860.pdf
    • http://teenmag.cz/userfiles/file/benafofizuwudakataji.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/turive.pdf
    • http://snsi.jp/image/news_file/18193649153.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487cfdbba6f---21087986415.pdf
    • http://huzatfokozo.hu/editor_up/51139185783.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/3183135801.pdf
    • http://phuocthuan.vn/images/pic/file/kirupanilejumulepo.pdf
    • http://www.urbanwaterways.info/files/29705174047.pdf
    • http://burattinojatek.hu/userfiles/file/gefijenefo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=clean+master+pro+apk
    • 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_off0000b2a2.bin
8d6e811b2ff68f758e805de43732a0d554731b0f38bfa8c45d78e64d54a68f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 10444 bytes
font_01_sfnt_off0000ca57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 16792 bytes
font_02_sfnt_off0000e269.bin
8ba2dd56f3ebf555edb454b0b07f69424c8cc9bf2dd62f7df6f6ea263eb1c22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 17236 bytes

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