Malicious PDF — malware analysis report

Static analysis result for SHA-256 820b0431ba118f2a…

MALICIOUS

PDF

83.6 KB Created: 2021-03-24 16:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d9789741244fc65062ec1eb76ef72d29 SHA-1: 75d640e70eb9349aa92c08d870910007a1e04df6 SHA-256: 820b0431ba118f2a1ca9c05c496d2eb5f84aec522ad848693ae82636e3870420
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 5

  • 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 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://mezovuduw.ru/123?utm_term=fcc+structure+information PDF link annotation
    • http://rowikisiwub.22web.org/wugadilexajajogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_5fce8c7807c34.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/80238864241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5ff8ed5c2cfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_6044dfd63bdae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_601ba1c4a1580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_5fd1452bc1847.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/niseverinevokeludut.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_a74df3dc0ce34d20b22af5833949d159.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8575872d-d11d-4c56-9491-9531926fc077/orbiting_the_giant_hairball_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/10565613335.pdfIn PDF document text
    • https://713ff9a1-ee4a-4317-942a-697bf1b0458e.filesusr.com/ugd/e2f197_96c084ae58f94084812501ef97c5849e.pdf?index=trueIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/facebook_app_free_latest_version.pdfIn PDF document text
    • http://mejavifoxeb.rf.gd/mepinitowolulo.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_36af89f8d55a4f03aab4833fa0dfe02c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batiku/accounting_principles_101.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/84976109148.pdfIn PDF document text
    • http://mesuwepuru.epizy.com/barcode_128_font_for_word_free.pdfIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/charades_cards.pdfIn PDF document text
    • http://gevegure.rf.gd/34947402541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e899c4f2-8bf5-4679-b11c-9fb9071a1f2d/pekegufanabi.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 4952 bytes
SHA-256: 5541fb7f8d71e376acfd6b56d8b0bed9c17bcf38435772eafe2f05c8148f0093
font_01_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 11940 bytes
SHA-256: 767d580ec432f884772a782ed7a8edf48a140edaa9215fd5153f6bcbe2c97d19

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