Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77a75ccee66f45f…

MALICIOUS

PDF

74.4 KB Created: 2021-02-13 01:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38a70713e5aa61def3e26998d2389960 SHA-1: d7ebb0d08053de529b0ce905942f4b6673964fa6 SHA-256: e77a75ccee66f45fc55e51b091bfa14856af710bd8b2f765319bd78ce426ef8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jacksth.ru/wix?keyword=basic+atomic+structure+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/munuluxel/8yEK8PP/juvisep.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/nAeYhf5/mega_photo_pro_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/if2fr3c/sputnik_1957_shop.pdfIn PDF document text
    • http://help-verification.com/amphibian_deformities_current_state_of_knowledgeww86g.pdfIn PDF document text
    • http://draiwenstore.online/76015887876b84wt.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/7780208562hbesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405922/normal_5fca12b36dbbb.pdfIn PDF document text
    • http://eurozone.pro/72836401474l553z.pdfIn PDF document text
    • http://lazadacostumercenter.com/282565226135jc1x.pdfIn PDF document text
    • http://arenaprobet.com/29202224793cbdrf.pdfIn PDF document text
    • http://uaportal.site/abba_knowing_me_knowing_you_sheet_music31283.pdfIn PDF document text
    • http://insta-sale.site/17634083601waurb.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/b07XTFV/gifebazigatuserujudogov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakapefetabol.rf.gd/circular_saw_rip_guide_lowes.pdfIn PDF document text
    • http://faberaladaruz.epizy.com/auditing_computerized_accounting_information_system.pdfIn PDF document text
    • http://musezuw.rf.gd/xolapizejonibi.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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 5568 bytes
SHA-256: 579e25aac7491968453c6ef0f49ca3c724e01ecc4ec035c6bb8ec7621e838914
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10704 bytes
SHA-256: 2d859df99f1d9f2ff1cbc7c16559db13f9624292af24b459a52eee66d7f82a24

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