Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b187e368deef1…

MALICIOUS

PDF

153.5 KB Created: 2021-02-23 03:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f757afb53a826a940c745c1d8c291f30 SHA-1: 840887dcfab4cc363f8d4b6105101b4458ca6959 SHA-256: 8c4b187e368deef10f93a5c329f7704940155d3785643b4f1babba26c29d5768
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/123?utm_term=athenaze+book+1+answers+pdf PDF link annotation
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/98794995b458.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/pigubokurizamedo.pdfIn PDF document text
    • https://werukubafufu.weebly.com/uploads/1/3/4/0/134000234/pupokigagowaxukudire.pdfIn PDF document text
    • http://farexirofabi.22web.org/cheema_cheema_dj_song.pdfIn PDF document text
    • https://rutemaja.weebly.com/uploads/1/3/1/4/131438840/4088173.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/9846880.pdfIn PDF document text
    • http://my-favshoph.online/adding_fractions_gamexrlnp.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/nakegagu_xipisumu_katakaxix_fisetixijed.pdfIn PDF document text
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/29c62bf524664.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/pumezitotarula.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/welili-nojeperuwo-ravavepadu.pdfIn PDF document text
    • http://counterman.ru/designer_cv_template_psdqzkzj.pdfIn PDF document text
    • http://iwhite.space/651692719515s6va.pdfIn PDF document text
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/fazajo.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/wufeb.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/najipavez/fuxugiresofini.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/android_bitmap_scaletype.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F91A 5484 bytes
SHA-256: 32fed5e4fa724235cce7435e87dac2ce98ed3cc2b7955e5a3b7eaf74a779e22a
font_01_sfnt_off00020bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BD1 18624 bytes
SHA-256: 00ef473bf6cff35df9b23fc7c46eaf35048b5f1f2f2be22ebf50f41fa8e2346f
font_02_sfnt_off0002430c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2430C 16116 bytes
SHA-256: a7b94f97b9497b482962a6088c52838fc4d6396c7535a08dcd3d8691766d53a6

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