Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb21fea7a357dad5…

MALICIOUS

PDF

71.8 KB Created: 2021-01-11 11:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d51ff8833cb7414579451fcd3a27f08f SHA-1: b34e562bbdc4bd1243aa48c767932694f959a6c9 SHA-256: bb21fea7a357dad59f776c1516c36a66e3174513dcc273c2cb2ca7cff1bcaf3c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=infinite+painter+pro+apk+6.3.59 In PDF document text
    • https://cdn.sqhk.co/bovokolel/YIjicr8/500_words_bronze_winners_2019.pdfIn PDF document text
    • https://rawavofim.weebly.com/uploads/1/3/1/4/131452817/vikedodize.pdfIn PDF document text
    • https://site-1173990.mozfiles.com/files/1173990/81950432818.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iicjeif/maryland_national_and_state_parks_pass.pdfIn PDF document text
    • https://site-1198442.mozfiles.com/files/1198442/messenger_downloading_photo_prank.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/ledewix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fd1c328c392f.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/wagejakofexaro_xerina.pdfIn PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/6937638.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/rakabexozu/romow.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/mirazejopejitawuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/27489429075.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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 5316 bytes
SHA-256: 7d0ca5762eeedc4e7cad8f9fb3f45d8f03d0eccba14651767923510b56d8c205
font_01_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10056 bytes
SHA-256: 8d0617319f9822d43deaac346c270ff364dbddb0a74580f717d5521b399f91e1

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