Malicious PDF — malware analysis report

Static analysis result for SHA-256 087767ed04720863…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 22:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 502df86d29e63eff257b60c1be93ed8d SHA-1: acc33ea911ec8a377becc5d8e9c4bad91cd17bd1 SHA-256: 087767ed04720863778392ea5562b9044ebdc52b9ad961c06120acec39e40648
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs pointing to other PDF files, indicating it is part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a malicious intent to redirect users through a network of disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://veganogle.es/uploads/ckfinder/files/72477897565.pdf
    • http://autavrabek.cz/obrazky/file/18648525627.pdf
    • http://daisytalavera.com/userfiles/files/lulurovepexigozofose.pdf
    • https://benhgout.net/uploads/Files/file/juwotaduxejevutuvu.pdf
    • https://asesoriagade.com/app/webroot/files/files/24532479467.pdf
    • http://duythuc-bearing.vn/uploads/userfiles/file/26928090241.pdf
    • http://ke-sen.com/userfiles/file/1631877766.pdf
    • http://cuacuontoanthang.com/media/file/limusijigiwenuxel.pdf
    • http://gekon.net/userfiles/file/73636356620.pdf
    • https://subded.org/userfiles/file/xapakar.pdf
    • http://asacnfservices.com/ckfinder/userfiles/files/pesidasefunalamizosoloso.pdf
    • http://good163.cn/Uploadfiles/files/82305765201.pdf
    • https://tatsolarlight.com/uploads/files/vabebivokelewakajafati.pdf
    • https://karolinanowak.com/userfiles/file/wigipudowapejarovowosif.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/vizene.pdf
    • http://www.szphotar.com/admin/img/files/115762941.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/xiteneberotix.pdf
    • https://support-trevianum.nl/userfiles/files/sinubatego.pdf
    • http://albino-pitti.com/pub_img/file/30233263891.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ae3672c3---44541700262.pdf
    • http://oipipleszno.pl/userfiles/file/zadujogepuvasinabu.pdf
    • https://khanikango.in/file/sutejoxomefodifomemeg.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161463b6bdfcba---561748299.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=xray+mod+minecraft+pe
    • 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_off0000d157.bin
5c19f9259fd4726da15627c8ed0bd94b809be1ff725463abfbeba488ac74f8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 18848 bytes
font_01_sfnt_off00010296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
font_02_sfnt_off00011aad.bin
9df0b6c589dcc3cc7e6cc1c4b55898bd6ab32bf59b286082f49199eb2157bffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 10688 bytes

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