Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fb3c3f7931d872…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 22:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33e8b1ab3061812b875d3295bb8f1873 SHA-1: e0f45b4d37faec70361efd596512da53568a2e40 SHA-256: f5fb3c3f7931d8727b9fbe25fb3ed1f615848e8e2ccba8569b9e0b9480d96dd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. The embedded URLs, despite one being marked benign, point to a pattern of directing users to potentially harmful external sites.

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 https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s0kig0rvje29pdd0h3p0vt937h/6243289727.pdf In PDF document text
    • http://kxqcgs.com/filespath/files/20210906124940.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/66744550321.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/fakibisopagofowuxujom.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/84558979741.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/14358622253.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/suxedurazutuxipizidujuzi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/082315511788.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/75449082649.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/falaludatugubujigafal.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wepikalufidune.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/4625198384.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/jazefunodu.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/nuzavuwatisi.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/bipet.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/74094032574.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/13587443739.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/85291575386.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/91475756934.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/20875771333.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/fawazinazuxofonago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+your+own+alarm+sound+on+androidPDF 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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 18032 bytes
SHA-256: b5211ca1f05f2a8e4e571b846f4b2e02671d5d2846a36b69e5b26a85d046f881
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10792 bytes
SHA-256: 46ed392d46d3467cad5c1a30b885988fb8a5ac96d746f5fa638c842731b9dff2

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