Malicious PDF — malware analysis report

Static analysis result for SHA-256 db345568ee6e6a72…

MALICIOUS

PDF

77.0 KB Created: 2021-03-02 03:00:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 35146372f60fb9c4e5f5ba09ef11eb6e SHA-1: 3a7b714e56f51382bc1411ab1c3c99b831a008d2 SHA-256: db345568ee6e6a725e822eab0c0dc95d283e4f7fa3ce7ca72e904e13d6af199f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or content-scraping operation. The ML classifier strongly indicated maliciousness, and the heuristic firings point to the document being a link farm designed to redirect users. No scripts were extracted, but the overall structure and URL distribution suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://lozipotod.ru/wix?keyword=ford+fiesta+haynes+manual+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529281/normal_603945670acf2.pdfIn PDF document text
    • http://zootime.store/83911397704h6avz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426942/normal_600731f9dc426.pdfIn PDF document text
    • http://kexipisibufexur.22web.org/zaveranololarodud.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/hydzaen/telegram_x_vs_telegram.pdfIn PDF document text
    • http://suguxilaxiz.22web.org/kojefakuzapaxope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409102/normal_5ff970ea45a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_602253ea7bfe9.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/drKgK9H/until_daylight_how_to_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_5fd24f6f49a7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_5ff7d3cd8ac1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_60359b10ee79e.pdfIn PDF document text
    • https://cdn.sqhk.co/wibepudib/hxnjgif/healthy_eating_tips_during_covid.pdfIn PDF document text
    • http://nigma24invest.online/171867325516dmkb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6012778b1178a.pdfIn PDF document text
    • http://liketime.fun/nawijusuxodanezixelufxz411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevebetuj.epizy.com/14405289395.pdfIn PDF document text
    • http://javasuk.epizy.com/admission_form_meaning_in_marathi.pdfIn PDF document text
    • http://meresig.epizy.com/kaze_ni_naru_piano_sheet_music.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_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 5340 bytes
SHA-256: 05decb023aeffb947dd621d6d07271b9cfb5f618be248d741e29b691d095d675
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 10180 bytes
SHA-256: eddcc7809df12b6cbe2e5566bd727d6e5193c2eff82f18c84d3a8bbf961c0f63

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