Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bf615178744ec8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 07:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 29c8683ac9c9de4d0a5e6d906935f247 SHA-1: b13f73bd11b0d69eef17a22575d5026f160385a7 SHA-256: f1bf615178744ec850067ca43f3afbdef76af02bd0969d798c15d53becc7ccee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

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://namjapizza.com/app/webroot/files/99530834247.pdf In PDF document text
    • http://joyandwowbook.com/upload/file/rarusezomojadikobibu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/66104114699.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/gajawotefivobixesag.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/niruvazokikotitoluxoparo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9kbd7rgcp60tmjh0netv47icue/32115908734.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/kofiwopij.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/xaromamop.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/68480435864.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/976593490.pdfIn PDF document text
    • https://bfull.ru/uploads/files/3223274960.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/vuwabilujama.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140916716a08---82504409237.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/rokebulub.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/50172047070.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/4164966744.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/55417611232.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/derozisifivesovulig.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17940930310.pdfIn PDF document text
    • https://12tiga.com/contents/files/90345429510.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/8461271632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=itunes+card+free+code+generatorPDF 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_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 10564 bytes
SHA-256: a37e3255d0dd6a8e9ac5124fca6e33c95d9cbd679df1d7395d3163c412110b3e
font_02_sfnt_off000118c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 17708 bytes
SHA-256: d2573e0b8c7cac39dc82e4c61f86d0bffbf08547ce5be6093a1ec6cc0c512ba1

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