Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc3e11261334ef5…

MALICIOUS

PDF

80.8 KB Created: 2021-04-01 11:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8f2f452b5dd12a93b3c2e907baa5b7c8 SHA-1: b6b808b3112f0770bc885e6ef81612f9423b72ec SHA-256: cbc3e11261334ef5b24bbfb65bd871f10af5f5a7bf57a173d5f09add684bd4d6
134 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are presented as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to shopping lists and PDF downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://druttle.ru/award?keyword=weight+watchers+shopping+list+pdf PDF link annotation
    • http://lifeeuro.info/ritewudinowuvoxa1xjo1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5ffa62a07a012.pdfIn PDF document text
    • http://xudisoda.66ghz.com/56114912145.pdfIn PDF document text
    • https://cdn.sqhk.co/vuveleni/ajaeihc/25552955888.pdfIn PDF document text
    • https://cdn.sqhk.co/tuturuno/vgjlDmU/lidatipuxoxowikegosogo.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hl7daif/parler_trading_symbol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_60275814b2de3.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/pezemupusura.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/UMif85K/44716443269.pdfIn PDF document text
    • http://zufutefej.22web.org/sprint_dial_codes_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_604040ffa85a5.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/first_amendment_to_the_united_states_constitution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5fd9c8237b804.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/92704141055u5wqv.pdfIn PDF document text
    • http://dokelamalide.iblogger.org/62298413577.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/fuzuriboji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_605d85896dca6.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/ghbheBv/kilimotadubofamudeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebbad6d-d508-428a-b5ec-adcb66dcc08b/xotogagetutebaburidoxi.pdfIn PDF document text
    • http://fugovolit.rf.gd/bookworm_game_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d3084b-a94e-49e2-b72f-78737a2a6412/reglas_de_acentuacin_de_palabras_agudas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b72814-b9bc-41ef-9bac-9ab2af28635a/boluraxofiwusomutibu.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/tipo_de_investigacion_documental_segun_sampieri.pdfIn PDF document text
    • http://biduvilavigu.epizy.com/catch_me_if_you_can_480p.pdfIn PDF document text
    • http://nijarigu.onlinewebshop.net/jawedolosu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 5520 bytes
SHA-256: d8737e0f8ef7e962e30837586766029df75c8d1b3bc1b0d975a2e5793a335d91
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 11124 bytes
SHA-256: 83658e814cb72636fde0b39be72cb63d4086afe433cd63812eb74feb60bfcb43