Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff45a0cf5b57f366…

MALICIOUS

PDF

67.9 KB Created: 2021-01-10 11:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f8542370c7982291e99bb0ae870ea200 SHA-1: ed9a234219854d71317fb3269840746f48c1c8f5 SHA-256: ff45a0cf5b57f366fe936ed0e55aa0575d0b1c7f0fdf36a1cb89a7a46133fc5e
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of multiple links and the overall structure point towards a phishing or scam attempt designed to lead users to harmful sites.

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://gettraff.ru/123?utm_term=generac+22kw+manual In PDF document text
    • https://site-1176996.mozfiles.com/files/1176996/iphone_12_vs_iphone_12_pro_max_gsmarena.pdfIn PDF document text
    • https://pejusokipa.weebly.com/uploads/1/3/4/9/134902294/gogupanoti.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/mydealz_black_friday_deals_angebote.pdfIn PDF document text
    • https://site-1176004.mozfiles.com/files/1176004/zibalefoge.pdfIn PDF document text
    • https://site-1177443.mozfiles.com/files/1177443/pepper_marketing_group_pty_ltd.pdfIn PDF document text
    • https://site-1178208.mozfiles.com/files/1178208/does_costco_have_fitbit_charge_4.pdfIn PDF document text
    • https://site-1173987.mozfiles.com/files/1173987/pubg_sound_equalizer_settings.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/ganubatebedoxez/92344327896.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/14060575695.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/dujamirotuba.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/kolkata_airport_flight_arrival_information.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_off0000ce9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 5088 bytes
SHA-256: 03e6ff718c7023e3f0059c03286e2c241f072f0dbbb836ad6e8351f1ebef09f0
font_01_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10428 bytes
SHA-256: 1de8775e69fd1a1a9c1ead43275aef205d29d45a1d94f5737a69307cb362c139

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