Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3c07242937a92e…

MALICIOUS

PDF

82.3 KB Created: 2021-10-14 00:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a059d74b0ef822302df7404394582c60 SHA-1: ca85a05b897f784ba8e9763bf7165f83956a4522 SHA-256: 7f3c07242937a92ea35113dbb7544cb07eb18d7ca984b8853bb77010425c09a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bacvietexpress.com/upload/userfiles/files/55730078095.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161613459cb26d---mulekuguku.pdfIn PDF document text
    • http://hkacca.com/userfiles/sekopefabodevegota.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/sagon.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/28210629839.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/5977897709.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/56694720895.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vozabamesurapav.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/10714183207.pdfIn PDF document text
    • https://viceda.com/userfiles/file/jujolowavibofu.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/tixemazopaxigamagomus.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/wirekidinumoran.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/94113395969.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/76776490530.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/wiwodu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/38734302794.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167033d9d162---kerewuvemesi.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vuvowexa.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/36447655367.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fuzixukoxulasix.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/godaliwuxuvexovikapafinig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=element+crossword+puzzle+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 10812 bytes
SHA-256: 124c0860d76dd20ae38ff2e48449ba64fc5e90e99f56f2c82b6923712c9d52a8
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 19352 bytes
SHA-256: 636c7362f718c15761088746dffa67216c8fd20c5503860de2b37ce0d00b1483
font_02_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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