Malicious PDF — malware analysis report

Static analysis result for SHA-256 2709931fc0e27d4b…

MALICIOUS

PDF

108.0 KB Created: 2021-03-21 11:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0c17331994069c7cc4f42ee40b6028e SHA-1: 9e02027304cfbeb17720143bb33c881805b73cda SHA-256: 2709931fc0e27d4b960d4fe3542dae4476bbc07af7c9da5594bb837eea292c0c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=bdo+warrior+skill+guide+2019
    • http://shoop-fr.ru/onan_10000_quiet_diesel_generator_service_manualz24pq.pdf
    • http://esclick.pro/nulokumabelevegunogepe8p2ew.pdf
    • http://xolokeminapi.getenjoyment.net/9957055408.pdf
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/5c8b0131a8.pdf
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/c44ccafc5ce77db.pdf
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/puxeguzekaluji-nunewaduxuzilut-liwasuzifun-ritirarak.pdf
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/fabe73d4.pdf
    • http://gagimubu.mywebcommunity.org/pugogemopub.pdf
    • http://digitaltoolsfor.xyz/fifowefab9plq.pdf
    • https://cdn.sqhk.co/ranetixeba/s8Ahdgh/brawl_troopers_hile.pdf
    • https://cdn.sqhk.co/kopenanum/sk8mcje/world_market_coupon_in_store_2020.pdf
    • http://zegererevez.medianewsonline.com/samsung_grand_prime_pro_full_specs.pdf
    • http://hyipinvest.site/14658582182rywd8.pdf
    • https://cdn.sqhk.co/dutararopat/OZhhigH/nouns_verbs_adjectives_worksheets_grade_3.pdf
    • http://just-gopro.com/pojenasakomekikonarelineg7oas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_852ea1ceef834e048e4b01df309baed9.pdf?index=true
    • http://dafunidubavilo.rf.gd/13579123240.pdf
    • http://sokiguxesixup.epizy.com/bheema_song_free_masstamilan.pdf
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_fe8a41d35daf44fc9981e5a86218229b.pdf?index=true
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_c643c962686e45189ef03877cb6cd646.pdf?index=true
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_d9380ae0e8b243468a5cf9b245fd3737.pdf?index=true
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_68cf031445b848459b55b3953cf0f2b9.pdf?index=true
    • 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_off0001698c.bin
c2f4396ad2284d3001f1174f3d11b2dfe523cd6c22aa2d7df9161695f975b1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1698C 5680 bytes
font_01_sfnt_off00017d0c.bin
135488bd8da68c6363812ea4168dd02e8998328b151586fad0919ea2a2c73841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0C 10952 bytes

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