Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ed7961121e6dec…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 22:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c796ce2986e2dd4f626e096215ef217 SHA-1: 5994ae048da20e1c93d482c3edf9a43c73bc997a SHA-256: d6ed7961121e6dec9826d2faa1c862120663d342d2823e1127d7737adb59592c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. No scripts were extracted, but the presence of multiple external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cardolf.ro/files/davelot.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c4048bdb2b03a727d04290a247bc9d0f/81464208285.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t1fdbgo34mdidqljvbpmor8e54/44143910362.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/novajafebisuf.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/losokanaludul.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/78035610985.pdfIn PDF document text
    • http://marymo.ru/uploads/files/48179531841.pdfIn PDF document text
    • http://gojjang.com/uploads/files/wukagegebukazabot.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/6215086690.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/xapirala.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_6C7E9A0C4A08495F.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/zarog.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/fixivipalufajut.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/bipiromenosebofawes.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/85111430052.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nideti.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/53520007668.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/piwaruxilifokowakegapiret.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/18951071062.pdfIn PDF document text
    • http://4yoga.by/pics/files/48907286134.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/37698556385.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/rijiwonemetilinen.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/24679834253.pdfIn PDF document text
    • http://zerosquareonline.com/file/97292990014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=iphone+5+in+bdPDF 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_off0000b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 10140 bytes
SHA-256: 68621c8ed4b4409c7c7af25cc2f9b438933488bb9c234e79842e2874f825793b
font_02_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 15928 bytes
SHA-256: 085682750cb4f209980c0a5e7adb0adb266f2fc83c56bcbd500fc47874cf67c2

Open this report in the interactive analyzer, or submit your own file for analysis.