Malicious PDF — malware analysis report

Static analysis result for SHA-256 425348a1782c0a86…

MALICIOUS

PDF

77.1 KB Created: 2021-05-28 23:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ba91816526ed200c61d336475a08a876 SHA-1: cca7fb68d2996a433d86338e298b57d4a7d4c277 SHA-256: 425348a1782c0a86b4fd24491b25913284090036af6ee88e4eca93acab8740fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable hosting services, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/93e2a106c2.pdf In PDF document text
    • https://nuzalegexokoz.weebly.com/uploads/1/3/0/8/130814177/1457004.pdfIn PDF document text
    • https://bavazaje.weebly.com/uploads/1/3/4/3/134335981/85e744.pdfIn PDF document text
    • https://nitejaxerovon.weebly.com/uploads/1/3/1/3/131379530/jabojure.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/visubekemoler.pdfIn PDF document text
    • https://josujobo.weebly.com/uploads/1/3/4/7/134713906/zaboto.pdfIn PDF document text
    • https://bilujujopubeda.weebly.com/uploads/1/3/4/6/134661541/widureroxo-tusavumarawuvik.pdfIn PDF document text
    • https://gowapatemik.weebly.com/uploads/1/3/5/3/135319450/dumixejekemarur_sibamegu_bezalos_liwuge.pdfIn PDF document text
    • https://nejufolij.weebly.com/uploads/1/3/4/8/134883139/7015991.pdfIn PDF document text
    • https://giwunivakezu.weebly.com/uploads/1/3/5/9/135957800/xakokeku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=charbroil%20grill%20parts%20amazonPDF link annotation
    • https://uploads.strikinglycdn.com/files/368542bd-84eb-4339-a71d-8b2e7d8eb2dc/easy_math_questions_with_answers_for_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee63557e-2662-48ec-bc26-eb47c9136002/lowrance_elite_7_ti_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada7fb30-fa21-4e35-8597-be7480d1dc9e/kumidegesugesutobekaboz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb8fb8b-66b0-4ed7-98a2-5780dad1b2f3/juxamovatusito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb147b5-7352-4d77-ad0a-00e5aff88814/35981426705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b82cc9a-4a97-43fd-be29-76967fbfe634/lon_po_po_the_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d0878c-7f38-4886-bb1b-31c9a17c735d/lg_sxs_refrigerator_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54838063-802c-4334-b666-dc1b0b231034/gobudalipujote.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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 5328 bytes
SHA-256: 11c9d5e3382a09509cd0bb074cf0a1d64426c800b1086aa4d53e2b03347019a4
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 12556 bytes
SHA-256: 0d1d6bab14e912df0c00be433dc408fa76f80d7e49876a4f10aff561cbb4c1b5

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