Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda27e5305c5a3cd…

MALICIOUS

PDF

67.6 KB Created: 2021-02-21 16:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aa71d8cb7716fef892684cadcd27d46 SHA-1: e6bbf7eadff5b33fa947988c4ae70692b6693c8c SHA-256: dda27e5305c5a3cd637d723668f3c4e2c74ae24bd0943306ec4ae29052716d24
244 Risk Score

Malware Insights

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

This PDF file has been identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link farm and a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or known redirector infrastructure, suggesting an attempt to lure users to malicious content or facilitate SEO manipulation. The presence of a link to 'yafferge.ru' is a critical indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://yafferge.ru/123?utm_term=wpf+binding+mode+oneway+twoway
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/cd8e9b848.pdf
    • http://nupubidodeje.22web.org/58761082414.pdf
    • https://pusexijubod.weebly.com/uploads/1/3/5/2/135296384/jofekamigosop-datijaxugum-lokaxo-zososemawukonef.pdf
    • https://zoxanomo.weebly.com/uploads/1/3/1/1/131163640/gafujuminifubotuze.pdf
    • http://bandalet.club/never_let_me_go_book_analysisyth2f.pdf
    • http://ig-support-service.com/arduino_for_beginners_bookbjz5j.pdf
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/bfdb695d71.pdf
    • http://nutapobo.iblogger.org/punob.pdf
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/mufok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wozowuledij/pulmonary_nodule_guidelines_canada.pdf
    • https://s3.amazonaws.com/zaxawetawupo/zuzebewurenorikilepita.pdf
    • http://kepipejesa.epizy.com/arya_full_movie_free_malayalam.pdf
    • http://rovututuxopi.epizy.com/calibre_plugin_drm_removal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f5.bin
c2717a167a2835864e77880642ce9b2d091cb4c43c4c33faa9e3f5577eb5b44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 5400 bytes
font_01_sfnt_off0000dc5f.bin
e0057c8e8b9015e8625d2b4fde8d3ce635a5bf413f94f329238f9308cef4231d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 10800 bytes

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