Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c60a6d5e2ed21d…

MALICIOUS

PDF

70.8 KB Created: 2021-03-22 20:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8d300a1da9a1cc7b531eddf027d9f482 SHA-1: 21f18d03ccb043dab366dfcac9ac5860f7d29646 SHA-256: 88c60a6d5e2ed21de2321a17a95f1540199bbecd07daa8b89c74b9d22d9e9a60
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to malicious infrastructure, and 'PDF_SEO_LINK_FARM' suggests the document's primary purpose is to host these links. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=number+of+abortions+performed+in+2018 In PDF document text
    • https://karejebesowe.weebly.com/uploads/1/3/4/8/134875170/taxekaniperuma-pojenoti-moman-feboruju.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/8bc404600be.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/60086839710.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/17175884046.pdfIn PDF document text
    • https://vejexuwelukilik.weebly.com/uploads/1/3/5/3/135340180/bf2ccf8d5cb9.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/augustine_city_of_god.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/naxasozugaj.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/fomezulowatemud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawivulumekil.onlinewebshop.net/apache_spark_tutorials_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4cfeac-5f83-4948-883a-c560f5f75033/6486063204.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_c8904977a4a344a89a60c577515ceaae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6523fdd-2647-4891-a147-1d859aad357a/rotekaxesafomurelowi.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/gnu_debugger_cheat_sheet.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/88888529492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b162b1ae-1177-4880-a507-3b40fcb633c6/2022494017.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/navigateur_web_android_5.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_085b1579fd28470192f2197cf57e0d12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/what_is_a_bible_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f979f72f-afc0-4c8b-b7d0-21fe525ec74d/stairway_to_heaven_kdrama_where_to_watch.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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 5784 bytes
SHA-256: 017e55e6d6df67ce0fd394da8a2aa21a1c4fca9b3d99e47002ad04f91c411fe3
font_01_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 10740 bytes
SHA-256: 14170fe93979b651ce668b9ebdd559ce719a0fbd1022cbd6cad75f7403210a90

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