Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa1b4a706249704…

MALICIOUS

PDF

78.6 KB Created: 2021-02-28 04:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 19160a96bd7fa21cd4ab2b478d4af03b SHA-1: de2e91d041fb82dfc7b1d80e81f5e56fa67961ea SHA-256: 1fa1b4a7062497045d190493c5a33a4516cf7f49b114fab75ff7cde310d7b57a
186 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=safety+1st+guide+65+sport+convertible+car+seat+installation PDF link annotation
    • https://cdn.sqhk.co/gufezitaxato/2JvfeBI/medical_term_clasp_knife_phenomenon.pdfIn PDF document text
    • http://santand-es.com/developing_chinese_elementary_speaking_course44q47.pdfIn PDF document text
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/119573.pdfIn PDF document text
    • http://vquest.website/brawl_stars_free_gems_no_generatorxsepu.pdfIn PDF document text
    • http://smeshnoykir.space/android_4._3_google_play_services_apkkp65m.pdfIn PDF document text
    • http://birjand.design/keriftanej.pdfIn PDF document text
    • http://buloshnaya.site/tri_tronics_classic_70_g2_owners_manualnfetn.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/RFjgiax/52379490387.pdfIn PDF document text
    • http://siteznakomstv69.space/thrust_bearing_chartu4qd0.pdfIn PDF document text
    • http://korsabarca.com/roller_splat_level_2000s3kf8.pdfIn PDF document text
    • http://salearea.pro/does_usps_send_internationallyc5m18.pdfIn PDF document text
    • http://lidlid.xyz/32058691957v85j9.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/KTijajE/kefibutitid.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/qge5Sgg/zopasotejenuxere.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/heibigE/the_intelligent_investor_book_in_bangla.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/UidPhdZ/38172259268.pdfIn PDF document text
    • http://bbcua.site/16484739613gf1yr.pdfIn PDF document text
    • http://hotel-engels.ru/481250697026ryua.pdfIn PDF document text
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/9a196.pdfIn PDF document text
    • http://tryadasert.online/the_man_in_the_high_castle_season_2_episode_8_reviewzvhzj.pdfIn PDF document text
    • http://summer-italy.fun/35718775381k7ktu.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/bebipilubelu_pasurijaxuganu_jezanaxumoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 6056 bytes
SHA-256: eef0e11bf806a03dd6a439d840940cfa8aa8a9a56375d3391966baebbe5df264
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10148 bytes
SHA-256: 4310a3c51255a9171897f43b66d7972468c1c439fc8cf86f92b683005ea9ca5d

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