Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8e99d2d894e75c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 15:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f27595c68ea3c09f0409657dc2ed6fe SHA-1: 8162991268df54bbbfab74c6e3a3875f4fa43627 SHA-256: 2f8e99d2d894e75ca9a1baaffd64cf78c850e8f2b06a2110e04f73b23d5c0dac
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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/strik?utm_term=harman+p61a+pellet+stove+price
    • http://mynasert.online/parallel_and_perpendicular_lines_worksheet_kuta_softwaregbfsh.pdf
    • http://bawimip.sportsontheweb.net/how_to_start_with_wix.pdf
    • https://static.s123-cdn-static.com/uploads/4380229/normal_60031825bca69.pdf
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/dd04e1c4.pdf
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6039fb201b170.pdf
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fc7f24c15f63.pdf
    • https://cdn-cms.f-static.net/uploads/4426557/normal_603298a4b3020.pdf
    • http://mxbur.fun/sentry_safe_wont_open_with_factory_code5eqfz.pdf
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fefe85edc3ae.pdf
    • http://50offit.pro/psychology_and_christianity_five_viewskk9cw.pdf
    • https://demenuxukuxit.weebly.com/uploads/1/3/1/4/131438289/3507498.pdf
    • https://zimemomikinipex.weebly.com/uploads/1/3/5/3/135347479/xefaweraxe.pdf
    • https://soneputud.weebly.com/uploads/1/3/1/4/131411150/siwivofowabumuzegi.pdf
    • https://jopogerepoji.weebly.com/uploads/1/3/5/3/135307159/2735295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/16186db3-13bc-4e57-a2cb-f458b2d5b6a4/texuvufemes.pdf
    • https://uploads.strikinglycdn.com/files/03fd5360-4fe0-42ce-9fdb-ceaef8d7182d/kofusimuvixegatupaden.pdf
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_bab66f0a082840958ed868679b37384f.pdf?index=true
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_0510da91cafd4cff8b9fb87892e2633b.pdf?index=true
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_cca2680ce4b6490c8fdeadad57f87a6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a20497ba-d5d2-446e-908c-ab75339c7411/32432628349.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_2c64344a4cff4993897958008ea53bed.pdf?index=true
    • http://limufij.myartsonline.com/4_week_workout_plan_for_weight_loss.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_1964ac03194c417fab3ebf13943c129a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/518edb54-f598-4faf-9520-7ae266bb55fb/fababuborisuwawetexu.pdf
    • https://uploads.strikinglycdn.com/files/33afe540-6f82-4f9f-808c-a3e50c26c527/big_little_lies_season_2_episode_1_song_credits.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_off0000f6be.bin
6cc10b4093fa5f420d3820b9c3cdff93fee8d5ed34c3820bd9e549ed378ac20a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 5308 bytes
font_01_sfnt_off000108bf.bin
fc512742788687aa0b62986b677563d9298e38ba20fc014ae1c637b289a08ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 11372 bytes