Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ec6ce1a03a0cb3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-15 22:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c0b496bbb0563f3f350283994706cfc SHA-1: 9f0c956ae3bdafd174eb5b51d6947c73f6ffbe95 SHA-256: 72ec6ce1a03a0cb307f82d002d79524f07a0bde0f79711df34d01d6aa1922070
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a number for a fabricated issue. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613734a2f14e3---18078653863.pdf
    • http://jncs.kr/page_data/file/20210902095910.pdf
    • https://coonvalleycc.com/userfiles/file/zejonenep.pdf
    • https://felicityokolo.com/file/fawobesugopekelija.pdf
    • https://edouardweil.com/userfiles/file/zadelidumukigenata.pdf
    • http://quatanggiabao.com/images/uploads/files/55046756967.pdf
    • https://cmoretv.com/userfiles/rizaxodibup.pdf
    • http://sarljarry.com/userfiles/file/8130149931.pdf
    • https://ndmoyun.com/calisma2/files/uploads/37248390202.pdf
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/88353222839.pdf
    • http://megatex-plast.ru/pub/file/pomezaz.pdf
    • http://protetyka-lublin.com/images/wyswig_images/file/3993621006.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/puzabaziwu.pdf
    • http://tutek.eu/userfiles/file/tuxemefamituruluwefobex.pdf
    • http://masterref.ru/editorfiles/file/pexotibokum.pdf
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/67791243066.pdf
    • http://gccde.com/downloads/blog/geust/files/dujomosomukemalidepunaki.pdf
    • https://cowichanseniors.ca/userfiles/file/63623118219.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613477d7058c6---zolidawimogawujud.pdf
    • http://studiodebiaggi.eu/userfiles/files/jesozarezagadudo.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/26735051276.pdf
    • http://decorstore.eu/upload/file/viwukefez.pdf
    • http://biancoacolori.it/userfiles/files/jebisoridemesolomab.pdf
    • https://datatech-int.com/userfiles/file/xerid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=real+bet+correct+score+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_off0000bb54.bin
723592d60b858fa5d79e58f353c60d10c9eb05e7e14359494fa4c300a1dbe132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB54 17576 bytes
font_01_sfnt_off0000e871.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 16792 bytes
font_02_sfnt_off00010088.bin
9cd6087647b58dd9aa4e43577cf5f17c7807365815fb33a18245e3f4e0de1940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10448 bytes

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