Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac5e7bcda54515a…

MALICIOUS

PDF

74.7 KB Created: 2021-01-10 13:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 34478eaa094c8134080ebb3899875de5 SHA-1: 9607e0a0e81b7eedc4cb8fb5c34c0d2cc440476c SHA-256: bac5e7bcda54515abbf3ce7bb01ae3203f6223c7542fbe525f75100d4b72c02e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, which is a common tactic for distributing malicious content or conducting phishing campaigns. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=hurlyburly+monologues+characters PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fedeec1145bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fc2956d09f2f.pdfIn PDF document text
    • https://site-1176782.mozfiles.com/files/1176782/74374632683.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/4315409.pdfIn PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/wheel_of_fortune_game_on_google_play.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5fed25fe642d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_5f8e4def1ceaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5f8b7557c458a.pdfIn PDF document text
    • https://cdn.sqhk.co/dufikibagi/jiZmhhQ/toxakepebujodizukupuvifoz.pdfIn PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/android_7__0_frp_bypass_tecno.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/iilja5x/nikemujobesufejatatogot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/79673202927.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/nojoresututavupigo.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_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 5416 bytes
SHA-256: 5949194b31531716bc69b131db3f945a5d19782d262aabacc14146168c973db0
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 11688 bytes
SHA-256: fb210405c88c2ad4734ffe4519555761a0fc7ac0c0d8df10bdbce2a5eb86ae56

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