Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9f9eb3a2b72573…

MALICIOUS

PDF

78.7 KB Created: 2021-02-23 00:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e0cf87aa4fdc44752f952b57f38359b SHA-1: 56168036c598e0214cc56d8c95bbdcb6f51ecfb9 SHA-256: cf9f9eb3a2b72573ee51db09da50e325a8be456ed2abdd3529620a3af39e7f48
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

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 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.
  • 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.
  • 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://maypoin.ru/strik?utm_term=another+word+for+car+ride PDF link annotation
    • https://kebopudej.weebly.com/uploads/1/3/5/2/135298692/a11b9b.pdfIn PDF document text
    • http://fasad-dom.site/87219571785o468l.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/refufiveregefokiweka.pdfIn PDF document text
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/5fc4cec30c2bd1.pdfIn PDF document text
    • http://keksik24.ru/nopexiwoborx5jq8.pdfIn PDF document text
    • http://montana-media.com/motivational_letter_for_bursaryavaic.pdfIn PDF document text
    • https://xokekujederal.weebly.com/uploads/1/3/0/9/130969763/6527736.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/e4d0833441944.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/gejiege/gumball_dino_dash_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panekad.rf.gd/93120315784.pdfIn PDF document text
    • http://zopefunexot.epizy.com/mass_effect_art_book_expanded.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/93533244803.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/peaky_blinders_season_1_subtitles_yify.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/android_assets_file_to_byte_array.pdfIn PDF document text
    • http://muxokekadakux.epizy.com/charles_capps_youtube_angels.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/nesaropoba.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_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 4980 bytes
SHA-256: 8ed78a480631b192aac858dbebf68d008d44828a73720a6c12552bec5db122c4
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10676 bytes
SHA-256: 30be1c650f81de5fd264532aec98260869373038f8c72980542a4bb41553c477

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