Malicious PDF — malware analysis report

Static analysis result for SHA-256 91583dee38dabd9a…

MALICIOUS

PDF

93.1 KB Created: 2021-04-05 10:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d8056be9af5cfbe3ef87e7c6d60e04d8 SHA-1: a97715ad89f0a1799001a61450ad442118e4d7a2 SHA-256: 91583dee38dabd9a8893f0ce5b6b2919f8160c7246f8fbeb2491d4266628258f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://maypoin.ru/123?utm_term=arizona+food+handlers+card+test+answers+2017 PDF link annotation
    • https://cdn.sqhk.co/dugixikisim/hFI9tYC/29176865825.pdfIn PDF document text
    • http://zujoxuxosaja.getenjoyment.net/abraham_joshua_heschel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_6063521147f02.pdfIn PDF document text
    • https://kobosarajuxinit.weebly.com/uploads/1/3/0/9/130969632/lulogi.pdfIn PDF document text
    • https://gimezoribetigaw.weebly.com/uploads/1/3/4/6/134676461/1378252.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/html_to_python.pdfIn PDF document text
    • https://cdn.sqhk.co/nimawabej/gGYjeLp/battery_day_tesla_date_live.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/haYhcpa/domino_pizza_calories_per_slice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_600d0a51bc473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366045/normal_600643a31d6b4.pdfIn PDF document text
    • https://jeregixir.weebly.com/uploads/1/3/1/3/131381720/1905377.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/gejavewano.pdfIn PDF document text
    • https://gapibuxox.weebly.com/uploads/1/3/2/6/132695643/c0e2adf5d6c53.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/ibggUjg/drivetime_houston_north_freeway.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5fe2a64c95ca0.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/pukixajegoja-patumalow-morogu.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/ghfhiij/gowevunekujude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/dan_brown_inferno_series_order.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/arewa_comedy_zone.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/loputaruxumezusulagif.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/35360399712.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_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 5648 bytes
SHA-256: 1e47c46c57d17c92d81bde38018e2b946b57567b161ff0fb8955c306cbaaa8f9
font_01_sfnt_off000139b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B0 13088 bytes
SHA-256: f3e7ac65bece08387b560d229dec811fc14fd64c4eeaca485bf5dd1e4a84ee15

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