Malicious PDF — malware analysis report

Static analysis result for SHA-256 e187d4eaedb3a20f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 04:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30b36a636729d37bae9114a022e0dbac SHA-1: 29ebc775ce4fe196a42575cc09f4fe67b0666de0 SHA-256: e187d4eaedb3a20f1a4d3a5f2a77c21732057565309016e2346eb83c19c4344d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://nomylo.ru/uplcv?utm_term=configura+mail+aruba+su+android
    • http://margheritango.it/userfiles/file/34234207579.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76076006750.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/zudeleragopapumotasa.pdf
    • https://dla-pracownika.pl/pliki_user/File/kigojedifop.pdf
    • http://mindatpeace.us/uploads/files/mitejideriro.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/30753261999.pdf
    • http://ecogestval.com/userfiles/file/sepodisilelobowatinefi.pdf
    • http://boatmonies.com/uploads/files/vegazafazobozo.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/99557653621.pdf
    • http://hytechcommunications.com/userfiles/file/tixudililojevarabugisa.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f955b603---lezes.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/96134420388.pdf
    • https://migger.dk/userimages/file/54458631345.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/il0b756pvisrqoflmln0d7v297/86686318778.pdf
    • http://onlinetradeshow.ir/uploads/files/nivavegijo.pdf
    • http://fishtech.org/uploads/userfiles/file/file/tewafafuweselutugifewo.pdf
    • http://vxclouds.com/userfiles/file/84453496369.pdf
    • http://drcleancenter.com/uploads/files/202109030459006849.pdf
    • https://nilsahost.com/calisma2/files/uploads/getarinalusaviv.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/56802882224.pdf
    • http://sosnovgeo.ru/userfiles/file/xoloralidekofu.pdf
    • https://reparationmobile.net/userfiles/file/gafelelapesokabekagipifuf.pdf
    • http://clickvay.com/upload/files/96228314301.pdf
    • http://tano-cable.com/d/files/72189667537.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000cde1.bin
8fbb8dc41c9674ab4e99161e368055b7ec873f9f207186e235cdb09bf2f387c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE1 10740 bytes
font_01_sfnt_off0000e64a.bin
4a6668781db59cb38bbee267e2b934998cce9079e96dda1bdf3367844ab73a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 17984 bytes
font_02_sfnt_off00011493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 16792 bytes

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