Malicious PDF — malware analysis report

Static analysis result for SHA-256 db79f394fafa442c…

MALICIOUS

PDF

80.1 KB Created: 2021-01-17 22:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 311d773231d360187915c78f7ab92eaf SHA-1: 3a7a9626f183cd80cb963120f2ce7d56b00b16f5 SHA-256: db79f394fafa442caf7c34a7a7dae73662f8f549b39fb9e9cedc5b0048f061bc
134 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. Heuristics indicate it functions as a link farm hosted on disposable domains, with one URL specifically mentioning 'malwarebytes license keys' to lure victims. The document body is heavily obfuscated, but the presence of numerous external URIs suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=malwarebytes+license+keys PDF link annotation
    • http://lizixute.iblogger.org/yahoo_answers_ouija_board.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/5872595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_5fd8e8253950f.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/snrHhge/falibizonatujiwanam.pdfIn PDF document text
    • https://site-1083588.mozfiles.com/files/1083588/splashtop_sos_pricing.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/bobukukow.pdfIn PDF document text
    • https://xobalodag.weebly.com/uploads/1/3/0/7/130739625/6489938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fbf1878e2f14.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/next_business_tycoon_2_coupon_code.pdfIn PDF document text
    • https://site-1178429.mozfiles.com/files/1178429/69877520900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5fd86be64d6d1.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/617951.pdfIn PDF document text
    • https://site-1174394.mozfiles.com/files/1174394/9538949116.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefigubisi.epizy.com/kabali_tamil_full_movie_free_mp4.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_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 5196 bytes
SHA-256: 1a6391c4f9c82ca2666bada96b7409c0403df4ca189aefd2f8ce1303f819f8f0
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 10500 bytes
SHA-256: ea937390dfd8c607ab68c5ef67899336ac5827835230ea6b10e43bb52162a66e

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