Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca58d9c2bd159ca…

MALICIOUS

PDF

73.8 KB Created: 2021-01-13 13:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5853c199c213aef6780fa422efdd0711 SHA-1: 17a25aef0e3b03e01183b0eb181f5c5d07d393bb SHA-256: 0ca58d9c2bd159ca2d80656f4dbec58b3e5c07db94f978e1ebfd240c81aa2182
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector services, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'gettraff.ru', a known malicious redirector. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest the document is designed to lead users to malicious sites, likely for credential harvesting or further payload delivery.

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
  • 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/aws?utm_term=bestadbid+popup+on+android In PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/poxofow-sesix.pdfIn PDF document text
    • https://site-1177275.mozfiles.com/files/1177275/hsbc_expat_explorer_report_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f875b2a4b908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5ff049914dea2.pdfIn PDF document text
    • https://busununivid.weebly.com/uploads/1/3/4/7/134774072/kafoni_jagonepomota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5fbb6788cb126.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/sujoduzu_pozumofuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f91c6f40a5e5.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/nIbqPgj/crazy_snake_worm_io.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/6c3ad.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/fuwawibu/filezilla_multiple_files_at_once.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5112 bytes
SHA-256: b033b582998179e43171bfce174ce18d0bbe42c685f1d8f8334ffb51b76f684d
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10380 bytes
SHA-256: 2f3479b7664a1ff2f6d39d157e82d109d8bfb331d92beb2742055822dfa369ae

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