Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50070cf13fce3b6…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 22:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 514ae47f517216e7129f8e980b366e7a SHA-1: 4d0c684930195a70b7cc72f70a7c916db45b307d SHA-256: f50070cf13fce3b60d93debb562c5b052b7b4f59824c27b96c19dd2afc9ca0d2
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://conganbacgiang.vn/app/webroot/uploads/files/54208632431.pdf
    • https://hetodon.com/fckeditorfiles/file/sediviketibaf.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/44980706161.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/zotovizeletukifanobetake.pdf
    • http://www.santamyoga.be/images/file/sorivowapuneme.pdf
    • http://golfvillageonline.com/userfiles/file/gamunifevezod.pdf
    • https://emmaushuis.org/pages/42379384787.pdf
    • http://pure-chiral.com/upload/files/vawuwelakaxobewibegameg.pdf
    • http://orvositudasbazis.eu/images/upload/file/veruzaviremezemavapekoza.pdf
    • http://studiodebiaggi.eu/userfiles/files/25918895059.pdf
    • http://saddabro.com/userfiles/file/tuguzibaso.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/supipegibupur.pdf
    • http://sayarbobinaj.com/file/68424061491.pdf
    • http://samnakthodrahassob.com/userfiles/file/sijarawof.pdf
    • https://erdenetpost.mn/userfiles/files/xupavirizajulodopa.pdf
    • http://mariekevanvlierden.nl/survey/userfiles/files/jozebeku.pdf
    • http://thucphamtruongthanh.com/img/files/36443692729.pdf
    • https://deitratech.com/userfiles/file/xoravokijo.pdf
    • https://stratasphere.online/userfiles/file/sidamugilelebovimolekabul.pdf
    • http://agisinfo.ru/uploads/content/files/pomenirijepebulunixafajiv.pdf
    • https://chsins.tw/uploads/files/202109131215592751.pdf
    • https://ptogel1.com/contents/files/jekisa.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ph0f2i28qaiq37k4ilhetehh93/79122145833.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fire+tv+stick+iptv+smarters
    • 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_off0000b1e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E8 16792 bytes
font_01_sfnt_off0000c9ff.bin
0b1b5d34b9fc59d870e95f0178cff53e95dfba208a1d64187dceaf721e9fc790		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 10400 bytes
font_02_sfnt_off0000e1a1.bin
827c58f79053e3d9ddf7e59409db6034cf81eac01142b7c8c536670aaddb168e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 16316 bytes

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