Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81a99a29b59f06f…

MALICIOUS

PDF

75.2 KB Created: 2021-02-15 03:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a8e0ea2b66c32b1d69f0129d0f55608a SHA-1: fa1612324fb06f6362cc49006a72ab191a8d9e7e SHA-256: d81a99a29b59f06f9ee40bca540ca9282918fe77ab05db9240cea9fd93579ad0
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-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://baarspo.ru/wix?keyword=north+africa+map+political PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454822/normal_60135cbc1c72d.pdfIn PDF document text
    • http://pmaider.com/87612608xg769.pdfIn PDF document text
    • http://tiktokfrance.fun/bexley_grammar_sixth_form_entry_requirementsl8iav.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/80442839902tlmmc.pdfIn PDF document text
    • http://fuzirirofo.iblogger.org/baku_baku_animal_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/j9fhdMN/nba_2k20_release_date_pre_order_ps4.pdfIn PDF document text
    • http://pasetbs.xyz/all_skillz_games_for_androida1xoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/jzieHia/original_prop_hunt_map_fortnite_code.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/3FjU7FM/kosigiregunapugak.pdfIn PDF document text
    • http://biomaniks.website/up_btc_marksheet_photo9krac.pdfIn PDF document text
    • http://disclosures.space/51994156878c7zeq.pdfIn PDF document text
    • http://kismykeitio.best/oxford_discover_grammar_6yhxtq.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/iijbPid/57139707605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voferumupisefag.rf.gd/gedalisivoxijileb.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_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 5048 bytes
SHA-256: 6ffd8340267842cdf65f7935f8ba954eea3f6c2362a3c276eb8e430496e373c4
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 10568 bytes
SHA-256: f9f42b0a6a64ae60fd3d04e71a09316757d86b244811e103e833f1a3edfd4a0b

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