Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f78b8428eea21d3…

MALICIOUS

PDF

73.4 KB Created: 2021-01-14 03:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31ac295d1cca9ecd83d9b8fd370dd0f SHA-1: 82e08e9c690106bbd26e8f7e36c6b663904eb221 SHA-256: 3f78b8428eea21d368808fb554c602a92707deb18c1bed3d40e571b819f2f451
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a song or movie, likely to trick users into visiting the embedded malicious URLs. No scripts were extracted, but the presence of numerous links points to an attempt to redirect users to potentially harmful content.

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://trafffe.ru/123?utm_term=wishing+and+hoping+song+movie
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5ff2f0ed1559c.pdf
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5fc16c037ad1a.pdf
    • https://site-1168045.mozfiles.com/files/1168045/suppository_definition_in_pharmaceutics.pdf
    • https://cdn.sqhk.co/xefijumu/fzqBghg/87174899016.pdf
    • https://milobixokat.weebly.com/uploads/1/3/2/8/132815045/e979708d7588.pdf
    • https://cdn.sqhk.co/nopawuwam/iclnHDf/secure_folder_galaxy_s10e.pdf
    • https://site-1178670.mozfiles.com/files/1178670/kujozegapakexevige.pdf
    • https://site-1199436.mozfiles.com/files/1199436/70815837966.pdf
    • https://site-1166710.mozfiles.com/files/1166710/dafevolanusibik.pdf
    • https://gipudakewisuvu.weebly.com/uploads/1/3/4/6/134665668/1824361.pdf
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/jidurudos-jujuwezugigetef-tobizixugopulu.pdf
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fb52da88dadf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b4.bin
e915fd777878842b356009aceb3e2d68c4c61ace5819a5498beebe4ebbbe5ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 5320 bytes
font_01_sfnt_off0000f3bf.bin
1aca98d622b29c2524573f1cacba9753621c1fcae3c7adef0af9bba2df9ae033
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 10928 bytes