Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587ca72438da50c…

MALICIOUS

PDF

68.7 KB Created: 2021-04-21 13:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0c5c2e27e7186e44cf2d57b9c6fbfe46 SHA-1: c09b0315b33cf66a83d8d83152ab9ea10676aece SHA-256: b587ca72438da50cef7aa4ccb1f7d55ee09882cbfad4bf240d058bb8417f7751
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=what+are+the+four+weather+fronts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388412/normal_603b90ae9820f.pdfIn PDF document text
    • https://morowuze.weebly.com/uploads/1/3/4/5/134580979/babofofuzub-tumafugazajeb-mesifumesulok-rapufiwudodana.pdfIn PDF document text
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/vumukas.pdfIn PDF document text
    • http://sait-ok.ru/xidatixukdalu.pdfIn PDF document text
    • http://mybatut.store/story_art_premium_apk_free_download56ckq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472495/normal_600140f34154c.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/1463486.pdfIn PDF document text
    • http://faceit.su/super_mario_bros_2_switch_controlsjc1gs.pdfIn PDF document text
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/110065.pdfIn PDF document text
    • https://jejenovo.weebly.com/uploads/1/3/1/4/131454593/b72180334aef74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472494/normal_5ff4e143a856a.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/podininome.pdfIn PDF document text
    • https://zageporipemaza.weebly.com/uploads/1/3/4/5/134507549/7087589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_60308771bfaae.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/xoralamakubasiderabo.pdfIn PDF document text
    • https://davixugamewa.weebly.com/uploads/1/3/5/3/135334906/rilifaneduweji.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/a353fb131a1f2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajofekozorofa.rf.gd/24360166463.pdfIn PDF document text
    • http://newurefaz.epizy.com/16481636052.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_a91ca56be07c4fda8c31fadfc2393739.pdf?index=trueIn PDF document text
    • http://sulosuduvemog.epizy.com/odia_hard_bass_dj_song_2019.pdfIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_fbb674e478984b5b9d2857a6b8d41559.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_f2b6e7b78e2f458590f6dd39d81d475c.pdf?index=trueIn 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_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 4928 bytes
SHA-256: 3107762caa785d23ea23418dcc92e06378d4d0d97b7a142f4bddf6bb768a8e71
font_01_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 10612 bytes
SHA-256: 36d4507f1db08ad9c4d8644cb4e85c024e96489566a143097a42e0d8273a571f