Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f1d8a1e46de472…

MALICIOUS

PDF

82.6 KB Created: 2021-03-17 08:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bc2dab0dcc879cfd5f4e11f66123dbcf SHA-1: 566d418d50b8ce050c5f597e3e44a8efb4930b95 SHA-256: 29f1d8a1e46de472a6ead84a9bf27423420b440f07302e9a6f98767184e97ee4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'appsc group 2 new syllabus pdf', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=appsc+group+2+new+syllabus+pdf PDF link annotation
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/nagivibutiwefomafud.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/72593254910.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/9FhfJhf/the_walking_dead_season_1_telltale_games_apk.pdfIn PDF document text
    • http://kidepokapila.22web.org/62157196657.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/9172127934.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/gfphh9y/slav_soundboard_russian_hard_bass_roblox_id.pdfIn PDF document text
    • https://cdn.sqhk.co/siripeka/japbqjd/average_speed_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/simixejazir/iXijjbh/marovex.pdfIn PDF document text
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/wesuwes.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/1jfiicK/wubukikume.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/iaWU6ie/93953822325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fd09c225804b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_6004c4c29ee94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497658/normal_5fe3929ea5bab.pdfIn PDF document text
    • http://zikubuji.iblogger.org/ladujejareguxiworugexito.pdfIn PDF document text
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/zibokewir-kerapimukusomof.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/xhdPBjg/talking_cat_app_dangerous.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/gniahe9/nufasifukewefagem.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/23770846622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vukagafiperi.rf.gd/hamilton_jacobi_bellman_equation.pdfIn PDF document text
    • http://rinotox.rf.gd/pevofuzo.pdfIn PDF document text
    • http://motuvogipe.onlinewebshop.net/fusebosegoxekobatow.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 5776 bytes
SHA-256: fafed70a731ca6c7190a86d4a0015787f518d93bea3922bbd03704778298e142
font_01_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 10472 bytes
SHA-256: 84b8f3ce8b49c18704d4b5d020f15b92b54d99010357005b5e77430ffec0e3c4

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