Malicious PDF — malware analysis report

Static analysis result for SHA-256 4367fe101a498ba1…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 01:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: debf89a3c09aa1262a0efb566ac4f52f SHA-1: 3e3e43018b76f18784afc8439cebbba6cbf92227 SHA-256: 4367fe101a498ba13761156af946a27f5085bf5517f13fc911b843897d48b2e4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=bungendore+public+school+uniform+shop PDF link annotation
    • http://sodalabs.pro/jonosituwokcqsrf.pdfIn PDF document text
    • http://drovazvenigorod.ru/xerox_wc_7545_fuser_system_errortmvvn.pdfIn PDF document text
    • http://levelupguild.com/calculus_2_test_with_answers0lcir.pdfIn PDF document text
    • http://design-kvartira.info/newasabefofanotipu5unjb.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/PiiZCgj/beard_styles_stubble_beard_moustache_styles.pdfIn PDF document text
    • http://opssmall.space/48096995481acjac.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/ejeJgjm/flappy_dunk_7542.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/g7YCqWk/world_war_tank_2_mod_apk_download.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/86945043010.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/luxelula/xeselivozetokosixaf.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_74ebde9ba6514ae7b67cc5c83fce3813.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_144ef101e6a8463caddc3a62e168b5dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac78472-6462-4f97-8011-b2cf0440ea9f/799865478.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/arcgis_server_manager.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_70d1290c30ea4482b4086cef3638c6ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e22201d-9843-4bef-ae72-da72646869cd/xasav.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_1a95fc111dc042b5a1d51b959e2c58fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06d6857-64da-4b00-a9de-1e1d01f91a6e/taxuzuwozolesexoxugat.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/how_to_pair_jlab_neon_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5175f238-e0e5-457f-89a4-b57f9d52becf/still_i_rise_maya_angelou_analysis.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_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 5548 bytes
SHA-256: 05620effe4cf5719e3b339bf656ef06c0be126bca0555d94d9e7db976774fc82
font_01_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 12200 bytes
SHA-256: d21bb8adf41177d5086eb2fb0fe152af2a35f2ba2dbdb958e5a09d59d320a31e

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