Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fde72e18845e4c1…

MALICIOUS

PDF

81.6 KB Created: 2021-02-14 20:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 36cd73e78c0954d6cdf3fba75b2fae53 SHA-1: 956a0e8465f76561485a3a5147acf242dc2a6f84 SHA-256: 2fde72e18845e4c1953dea404507f12cf779c359f04d234869d3196d6a0792d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=free+printable+continents+and+oceans+quiz PDF link annotation
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/ac9c32b8ca07.pdfIn PDF document text
    • https://cdn.sqhk.co/vawupemowa/zrhihf4/gopunifezoxomema.pdfIn PDF document text
    • http://vulgargirls.fun/cursed_minecraft_texture_pack_pe33vbw.pdfIn PDF document text
    • http://bubble1.space/dulcolax_suppository_davisivd0z.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/rgexghL/welawomiku.pdfIn PDF document text
    • https://sakavafufegig.weebly.com/uploads/1/3/5/3/135323197/welef_zobosadetugu_mamulididiwor.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/tuvawadezet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_6003162c57fed.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/hah3hiq/movie_night_at_home_snacks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_6015759f0fc2f.pdfIn PDF document text
    • http://gnoogle.site/psychology_in_everyday_life_download6art5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_602553524d3e7.pdfIn PDF document text
    • http://wofeboz.66ghz.com/jepukozematigeluvupajel.pdfIn PDF document text
    • http://erethiztzj.space/wallpaper_iphone_xr_4ksk833.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/ifKicqM/target_ninja_coffee_bar_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/idhi2ji/black_country_music_hall_of_fame_members.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/30590.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/jjemCig/nozotawonisiveb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_6019102b6ed03.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/9icxWjj/pewitatosobejafo.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://dusiwesidixe.epizy.com/ex-_a_document_template.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_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 5220 bytes
SHA-256: e9d951de46316ac31d18b9cfc2a4425fa6b8908e98b667dc81a1cc443f214e68
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10700 bytes
SHA-256: 97036d676623858096abbdf10db5b798c4796b43e9dec364c42868f2e7ff8689
font_02_sfnt_off00012ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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