Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34441d4f7809c2e…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 18:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb12191d8646b7ee0c80c311c6f011d3 SHA-1: c3e0e1c3498758bf22a24a6152794903a64e00cf SHA-256: c34441d4f7809c2eaa122d369c1830692a6e42dac80626a1d01cb8658ab8303c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=legally+blonde+the+musical+jr+ireland+lyrics PDF link annotation
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/morafox-fodezobodap-panidit.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/jicJIia/tegat.pdfIn PDF document text
    • http://carbackseat.site/38550010450mrtbt.pdfIn PDF document text
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/f6c2826655283.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/061a2cb743f.pdfIn PDF document text
    • http://musofiron.ru/972303850033lsjf.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/ggGjb5V/mimpi_indah_lirik_chord.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/ohbif15/white_noise_generator_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/hjZkRWx/56044526717.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/81056106918.pdfIn PDF document text
    • http://yourbigdick.space/pencil_sketch_art_photoshop_action54k9z.pdfIn PDF document text
    • https://jototafedapabo.weebly.com/uploads/1/3/1/3/131398279/b8deeea07.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/igNgihb/lapudem.pdfIn PDF document text
    • http://avto-document.site/101067870174sevr.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/tugezaduwuv.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/jio_mobile_video_calling_baat_karne_wala_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/16W6LFy/free_robux_app_2020.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/topipovikapari/fijota.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/charlie_puth_river.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 5612 bytes
SHA-256: 1e18a11f0dddf36e53579511216fadc629894711cac7834dfc14fbc138aba5f2
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 10832 bytes
SHA-256: cee93831865cdda11f1225805a15a8e6a11b2fbc93ae8614af7d1cc748bf60d1

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