Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1775a56f5c4b50…

MALICIOUS

PDF

63.2 KB Created: 2021-01-14 07:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3d91d03c28b640487bc067dbddfc2f15 SHA-1: e6fcf37166155b4c573e638e3137c453e1473c03 SHA-256: 3e1775a56f5c4b50c9cb30754f280a8945f5c664b93c9b4f60bbf354e90b931a
126 Risk Score

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-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.
  • 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=bighorn+cinema+in+cody+wyoming PDF link annotation
    • https://nulazonale.weebly.com/uploads/1/3/4/8/134892754/vibiku.pdfIn PDF document text
    • https://site-1171987.mozfiles.com/files/1171987/river_cruise_companies_australia.pdfIn PDF document text
    • https://sokegipamemaxo.weebly.com/uploads/1/3/4/3/134345901/6399629.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/9gjbiau/72635735462.pdfIn PDF document text
    • https://cdn.sqhk.co/nudavede/Q1jajby/bitidadexajazazosaxo.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/lemito.pdfIn PDF document text
    • https://site-1196822.mozfiles.com/files/1196822/56823050202.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/hjjgd62/basketball_3d_wallpaper_app.pdfIn PDF document text
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/vipolopapigiru.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/gofanagizojipukigorotugif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fikuvine/akash_pritom_new_assamese_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/blur_imageview_android_github.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_off0000ba2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2A 5384 bytes
SHA-256: c0ab9fb1b24dcd675db66197bdd3070a4d2cabd575c6e816f15f634922b9b0f4
font_01_sfnt_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 10788 bytes
SHA-256: ffa21040ad76068d7b07bd6352373961feeaffc3958d82756b0f8397ef470ce0

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