Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8646496e721cff2…

MALICIOUS

PDF

70.4 KB Created: 2021-04-03 21:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78a66535671715f40e4485906f191352 SHA-1: 7664be6023f1d48d07c6e25f0a0fce23320c4b6b SHA-256: f8646496e721cff2128cdcd58f137c2debcbca6a9fa6cc8480d76e41d9676186
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 0.9998

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://xajibur.ru/wix?keyword=mini+cooper+2007+haynes+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/nozedimasav/hheOjbv/hitman_goty_edition_ps4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fe3e462e50c3.pdfIn PDF document text
    • http://suberubepuparo.getenjoyment.net/acids_bases_and_salts_class_7_questions_and_answers.pdfIn PDF document text
    • https://baponejivo.weebly.com/uploads/1/3/5/9/135986917/baxev.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/liwitedenarufir-vubifolexejekip.pdfIn PDF document text
    • https://bipuvoru.weebly.com/uploads/1/3/5/3/135336843/tazabaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/cCvIDjh/lipenopuwoselirogajafo.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/bastard_out_of_carolina_download.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/2f569ebcf68ca2.pdfIn PDF document text
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/8644d9607defba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_6044d177a9d39.pdfIn PDF document text
    • https://raxitiladiruwek.weebly.com/uploads/1/3/4/4/134487911/pibevogavidejox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_6017190e60e06.pdfIn PDF document text
    • https://cdn.sqhk.co/degawatoze/ifgfg2F/golf_clash_clubs_to_upgrade.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/XggGLji/siren_head_mod_minecraft_pe_1._16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_ca42496d379d4353b64f9757679a673f.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_53039dcdeb284c2897ca2f64f53f0216.pdf?index=trueIn PDF document text
    • http://ketabigumowun.atwebpages.com/pathophysiology_of_anemia_of_chronic_disease.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_e1c0ce79cf2645e0a89cc1dee3b0af56.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_117cc37243784b778366349e94582ebf.pdf?index=trueIn 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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 5856 bytes
SHA-256: f3b0c4af8cd8a1ad145897411ddb7a59a58347a908b1a0a8b6429ebef33c9bf0
font_01_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 10436 bytes
SHA-256: 4099e9458b9cf3fb5ee9525f6aff4b14144924f74e83a15aae08c2b85015262d

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