Malicious PDF — malware analysis report

Static analysis result for SHA-256 771a2219274eb0fe…

MALICIOUS

PDF

79.7 KB Created: 2021-01-17 04:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dc826c47bad5058b36acebfcc591755b SHA-1: 51a006294d085cc2ac64b3793913c4e427ff89a8 SHA-256: 771a2219274eb0fede0960b0b5f2686e9016ccaf60e753a3d65c4eb730f66790
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?utm_term=complete+french+grammar+pdf+download PDF link annotation
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/pifojefas_jibanuporo_lajukasug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5fde86c03be0c.pdfIn PDF document text
    • https://site-1175317.mozfiles.com/files/1175317/blacksmith_leveling_guide_ffxiv.pdfIn PDF document text
    • https://site-1243289.mozfiles.com/files/1243289/introductory_paragraph_in_audit_report.pdfIn PDF document text
    • https://site-1210486.mozfiles.com/files/1210486/bibliography_formatting_website.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f8fa4c35c873.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/3866667.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
    • https://s3.amazonaws.com/zurovajij/78018201636.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/babbar_bhojpuri_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/76943558836.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/23276217854.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 5248 bytes
SHA-256: 02d8204898cc92664e8ac52dd7630156533a3b2bb7443dbece040356c3fe1afd
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 2664 bytes
SHA-256: 3c3ae01152998d079d14648c390976696914e3f2b08029c27b468523a3240402
font_02_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 10988 bytes
SHA-256: 5f1142fd97c23caaa0a75049afe574f190526aa8b2fcb0c6abd4d36aa06a3bb7
font_03_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16376 bytes
SHA-256: bc7e3f6831be34686de02ce7be2a06b9f1fa2b1a298201cd6e3dc3baf4672bf7
font_04_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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