Malicious PDF — malware analysis report

Static analysis result for SHA-256 4819a5f54bedf9e9…

MALICIOUS

PDF

72.1 KB Created: 2021-06-03 17:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aea1f902d7cffb3a7204164a32f81275 SHA-1: ed4168e34f179d3f616b99ae8121eb0ead6731d5 SHA-256: 4819a5f54bedf9e9d929d3c9a989c847b662e8a5b295858ca1702ee26e5ef77a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded content appears to be a lure related to 'heat and glo fireplace' searches, directing users to suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://drafthe.ru/pbw?utm_term=how+much+is+a+heat+and+glo+fireplace PDF link annotation
    • https://wapetosov.weebly.com/uploads/1/3/4/6/134665674/de6e676.pdfIn PDF document text
    • https://wagebesalumiral.weebly.com/uploads/1/3/4/8/134846814/jozefikagixu.pdfIn PDF document text
    • https://zazewefagawi.weebly.com/uploads/1/3/0/7/130776698/82b457bd6c7.pdfIn PDF document text
    • https://fuxomiluzixoxam.weebly.com/uploads/1/3/4/5/134594746/modid_sivamub.pdfIn PDF document text
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/2565909.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/3001132.pdfIn PDF document text
    • https://joposiga.weebly.com/uploads/1/3/5/3/135399072/nolixagofabexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_604d6eb3746b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_6055099b6dda5.pdfIn PDF document text
    • https://kavakisin.weebly.com/uploads/1/3/0/9/130969045/8ce6df7e5de7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_60321c79f27e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5fe2f472d6efa.pdfIn PDF document text
    • https://kurokeduzuw.weebly.com/uploads/1/3/4/6/134693898/1503934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_60571021614d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba73c57-d717-4db2-bbaf-9024874409ea/89092642269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c252c144-bce6-4d0e-814b-edba5ae29459/40764185137.pdfIn PDF document text
    • http://garigor.pbworks.com/f/kejupegugilewotirew.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144506202/what_is_the_best_type_of_marlboro_cigarettes.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/pinedemavefo.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411483/76558110092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4a29cf-4d0b-4d4b-a685-96d13ba73f66/jokinofuzogug.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144534834/how_long_does_it_take_to_prepare_for_tef_canada.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/does_ltd_mean_limited.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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 5624 bytes
SHA-256: 2a9d1c4dc30c6713d6ba4c49dff5b60950562c436dcf979dbcab454b999a68a7
font_01_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 10836 bytes
SHA-256: 55514ec291a2d7e64253b115078f9b0bdb64ef2423fd3c6d86e80571f52caa01