Malicious PDF — malware analysis report

Static analysis result for SHA-256 5947b778a5fa74fb…

MALICIOUS

PDF

88.7 KB Created: 2021-01-10 18:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f56234c723673e093f4c81e75191c4da SHA-1: c3616db0519d9c114e79b70aa318a253698e420b SHA-256: 5947b778a5fa74fbe88b7909a4e46948796b64855582c2e0879b106bba3b93a6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=persona+5+fortune+teller+confidant+guide PDF link annotation
    • https://site-1179818.mozfiles.com/files/1179818/verizon_cloud_app_login.pdfIn PDF document text
    • https://site-1174394.mozfiles.com/files/1174394/parkour_gopro_hero_7.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/architecture_santorini_buildings.pdfIn PDF document text
    • https://site-1179485.mozfiles.com/files/1179485/julewarupewo.pdfIn PDF document text
    • https://site-1173244.mozfiles.com/files/1173244/10565027612.pdfIn PDF document text
    • https://site-1180367.mozfiles.com/files/1180367/battlefield_bad_company_2_mobile_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5fd2f68a9e7af.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/ggfhfhd/81303567988.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/tggoZjb/talking_tom_cat_2_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fc0af40769a0.pdfIn PDF document text
    • https://site-1178504.mozfiles.com/files/1178504/catch_chocolate_bar_calories.pdfIn PDF document text
    • https://site-1168337.mozfiles.com/files/1168337/vejowaguxejimopovo.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/60056049061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • 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_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 5312 bytes
SHA-256: 88d3b24c013f209c0a871428f7bf727c6d8a10a572670126d63635787eec5dbc
font_01_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 10712 bytes
SHA-256: d2e39adab52efdda2e5134e14a7fa6d0899fa5b7ea090497f30b42ead5ec8b9c
font_02_sfnt_off00013f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 16348 bytes
SHA-256: 4d0700c2bed8ae31e296ea143d862b5f4c90f99d2dd4e3a41f3daee297692574

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