Malicious PDF — malware analysis report

Static analysis result for SHA-256 089215769de16f43…

MALICIOUS

PDF

71.5 KB Created: 2021-02-16 17:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d29c4bee5500730fcc090e2888e73058 SHA-1: 26290cd6f7eec5a63e8bf9333d94558a2dba6a25 SHA-256: 089215769de16f43aba101a4d77f29f34ad08d490934ea8f3d5ac962a5d63310
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically pointing to a site related to 'acute angle worksheet 3rd grade', suggesting a social engineering lure. The presence of external URIs and a link farm heuristic further supports the malicious intent of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/strik?utm_term=acute+angle+worksheet+3rd+grade PDF link annotation
    • https://cdn.sqhk.co/zebasama/aGhfTPL/93522565935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_5fd3130c8c080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_5ffcfaa39f285.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/Mgjhf8G/3779734688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_600dce17c994b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_601eff0cd3269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_6025cbed7fb49.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/Xhaq2ib/befepoxijagasuwit.pdfIn PDF document text
    • http://sejamilipigiseb.iblogger.org/isn_t_she_lovely_sheet_music.pdfIn PDF document text
    • http://kepamusujuboza.iblogger.org/tarepupazejuninogitidade.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/fYDhcja/tesejefeforerevirukofiwel.pdfIn PDF document text
    • http://takotonefajale.22web.org/3710826502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofuxanuwuj.rf.gd/73671679105.pdfIn PDF document text
    • http://gokozir.rf.gd/pandora_reflexions_bracelet_size_guide.pdfIn PDF document text
    • http://bagirisuteladog.rf.gd/dota_2_auto_chess_queued.pdfIn PDF document text
    • http://fuxezenoligasas.rf.gd/arteriovenous_malformation_small_bowel_icd_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/defezanefutim.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 5508 bytes
SHA-256: 588cb2b7f1d74264b70e09df7d1d3618b221332e6702f27a6bc766eed758886d
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10840 bytes
SHA-256: b8b61878229e549d558d197ad6766b01d4dade6674d42a400769e6a95d714cfe

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