Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b319d82831c2334…

MALICIOUS

PDF

77.8 KB Created: 2021-05-08 02:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 20076a0962cb1c9c174fa970775b2752 SHA-1: 6755264651d4fa811f568cbc4d9581856bea9c41 SHA-256: 8b319d82831c23349ef40e06d7c42ae9079c077fd081addce9ffd9ef9d49e16a
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 pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm structure are indicative of a spearphishing attachment, aiming to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=sat+subject+test+score+cancellation PDF link annotation
    • http://hhizmet.com/11546179396b4cir.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/why_is_leadership_important_in_childcare.pdfIn PDF document text
    • http://ukranews.icu/moto_x_2nd_gen_lcd_price_in_pakistanmj6i2.pdfIn PDF document text
    • http://helper-badges.com/dilobepoxertxwxs.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/weresejanezu.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/59c48b41bacb32f.pdfIn PDF document text
    • http://slamelina.website/zewipoweladadulic9qkv.pdfIn PDF document text
    • http://uscovidcharts.com/mamixavivijamolovenevojdgys6.pdfIn PDF document text
    • http://limecash.xyz/titoxitinifoddym3k.pdfIn PDF document text
    • http://wirajamosilun.22web.org/what_is_the_1_rock_song_of_all_time.pdfIn PDF document text
    • http://boforobevuziko.mywebcommunity.org/totogosid.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/fozivifibotuz.pdfIn PDF document text
    • http://ecoservice-vlad.ru/the_lost_books_of_eden_free_downloadda5fw.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/remuditizedoxav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_6fcfef58a60f4e4da2aeb81878497fba.pdf?index=trueIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_67aac2bfd3754e4b9d2805758592ce69.pdf?index=trueIn PDF document text
    • http://zorikeroz.onlinewebshop.net/99770449035.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_84b0ebe3eee54da58bf96bb2138b8c41.pdf?index=trueIn PDF document text
    • http://simipibenafar.epizy.com/65294398874.pdfIn PDF document text
    • http://pivipige.epizy.com/2663560226.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_d743c161a0334fe99e3f10bf635c93f1.pdf?index=trueIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_3e316797334441e7bedc33d5d3bfe0d7.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_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 5112 bytes
SHA-256: e5dcd23e9c4b48f10790b714399b1eb6ac93ae83a14501d650337830853d7e7e
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 11236 bytes
SHA-256: d0bd3f8b9b10cea1661d7a3cd38bea14d0ea1970bbf995b253294076db736c64