Malicious PDF — malware analysis report

Static analysis result for SHA-256 125b89b70c783d48…

MALICIOUS

PDF

78.3 KB Created: 2021-04-30 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c13b499614663784708d6786f0b91365 SHA-1: 725c4581dfc3a9e3ec3a515d52b6ff03212e552c SHA-256: 125b89b70c783d485dcb55714caf17ed65f8e5ee9889280f45f171769e463720
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=what+are+the+basic+tenets+of+feminist+criticism PDF link annotation
    • https://cdn.sqhk.co/wuzosiboweja/iehc92Q/3223643201.pdfIn PDF document text
    • http://tekcabinets.xyz/fb_lite_for_tizen2ekay.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/aneurisma_cerebral_pediatria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_60426cc6b4cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fdb0bb035481.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/c7bYPan/8260543347.pdfIn PDF document text
    • http://bupro.asia/what_is_a_quadratic_equation_examplej0yb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fe04ee06ff4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_6049c98fa144f.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/reading_comprehension_test.pdfIn PDF document text
    • http://dajexori.mypressonline.com/columbia_accident_investigation_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_605cf6148f579.pdfIn PDF document text
    • http://lorenbayi.com/good_news_bible_for_java_phones502el.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_604cdbda850b6.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/CTWgeqU/gavuwigajolopudo.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/jagfohc/project_free_tv_ag_surly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_600cd01f2e734.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/82718720670.pdfIn PDF document text
    • http://teleporttur.ru/51763778401fw07l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_603e179ae53f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://megigezorozo.atwebpages.com/barefoot_investor_2020_download.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/4364567158.pdfIn PDF document text
    • http://minivenema.atwebpages.com/meggs_history_of_graphic_design_sixth_edition.pdfIn PDF document text
    • http://mizetum.onlinewebshop.net/mushroom_biryani_recipe_in_tamil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 5032 bytes
SHA-256: 382303578e1e17354bd12ff77891d6ae61a21a18889fc3674fa14884fbd958bb
font_01_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 10484 bytes
SHA-256: da26959e6ff10e42c9d8ef8221cd58abc29634a6b9ba14ddf2bfca130274a20f
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176