Malicious PDF — malware analysis report

Static analysis result for SHA-256 f667ab5b07897a3d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 13:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45fc862bad29d0f3991fb94db07107c2 SHA-1: dfdcb43cd7c834692713a99b02784c3aa3457498 SHA-256: f667ab5b07897a3d88ec2ae2fadd23eb17e01effb0f5301844e9e423dcaf0330
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, suggest an attempt to direct users to potentially malicious sites for phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://takramaipai.com/mypicture/file/gajinenudatekogetuwi.pdf In PDF document text
    • https://megacook.pt/site/upload/file/datorokenujebi.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1149268336134e29c90fde.pdfIn PDF document text
    • http://rotang.net/userfiles/file/wojipuvuvutomojeb.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/37140469705.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020141552873.pdfIn PDF document text
    • http://exosushi.com/uploads/files/41411426231.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/79230439351.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/punolifexine.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79387404540.pdfIn PDF document text
    • https://photofetimages.com/66142397630.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/dapaguziwusutuxoluki.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/1187121140.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/47073265587.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/14303358564.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/55325578276.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tujeluz.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/97702672261.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/xapivuxutekaluwexibabuvud.pdfIn PDF document text
    • http://mqskin.com/luutru/files/51832091857.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/79103330154.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/pabaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=among+us+free+skins+modPDF 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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 18232 bytes
SHA-256: 6cc98d0bf90e164f185bd83969d95e77b9d8e6c1929cc789f4e7d7bb865fb89c
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 10564 bytes
SHA-256: ee8bb4dc4c4c892c48c5b035f2fb819a37c4fd98e6cd279b388e8d356516d28e

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