Malicious PDF — malware analysis report

Static analysis result for SHA-256 d944d78a30c36e46…

MALICIOUS

PDF

70.2 KB Created: 2021-03-25 17:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af4a3a9f8e9a7fc44ab916c80202e589 SHA-1: ac36ae59cd3ce3d1ae76b52bf57037fd8b686bf3 SHA-256: d944d78a30c36e460e59bfa1732c257662671cb90fe4416af2a3e8663058cb38
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous disposable domains, with a prominent URL suggesting a lure for office supply ink refills. The presence of embedded URLs and its classification as a link farm strongly suggest a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/strik?utm_term=hp+officejet+8620+ink+refill PDF link annotation
    • http://sefegusekepuxa.mypressonline.com/vebewodiwajedegufigax.pdfIn PDF document text
    • http://kufeduli.22web.org/les_accords_de_guitare_pour_debutant.pdfIn PDF document text
    • http://kepopuxididavez.22web.org/70368000269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5ff7840593a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fd60ccfd6702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_605a03a58a1ff.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/70143823714.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/paxojafipudajajasepijobem.pdfIn PDF document text
    • http://edevletorg.com/wanesizalwcn.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/zunetijuralaririz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370055/normal_60017bddaf637.pdfIn PDF document text
    • http://eurostore.info/cvc_capital_partners_annual_report_2018hbx8q.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/cylindrical_coordinate_system_derivation.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/bujezova.pdfIn PDF document text
    • http://wizuvadidena.iblogger.org/catchment_area.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_604e479784643.pdfIn PDF document text
    • http://circus.market/fekokuneferigabodifares6fhc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lufevexos.atwebpages.com/marksheet_format_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98068573-4ad3-4c6b-9673-f39861196c58/93494150445.pdfIn PDF document text
    • http://wusudafatuzawe.epizy.com/bozezubatapadevuxuwujije.pdfIn PDF document text
    • http://lidudoxodirabi.rf.gd/pdf_search_engine_open_source.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837ef31f-c2aa-4cc1-ae20-69751cb81433/what_are_the_types_of_lines_in_technical_drawing.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/90773863310.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_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 5344 bytes
SHA-256: 4e042dd561e3dcdefd9ecff7078ac775267e9a42fddbd5cf1c0f8ddaceb11673
font_01_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 10996 bytes
SHA-256: be611a1e20cebc3bd03e67d14831eefc415136b1bff80c4bb5b91b7f438dc63c

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