Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac53aec03e7b361…

MALICIOUS

PDF

72.3 KB Created: 2021-04-27 15:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 763f0dce8dc08d671270df3bb0f1f847 SHA-1: 4d3db9a33dddaf801e5755834d91fea93e8ab6ef SHA-256: 4ac53aec03e7b3615c9c6db7252830312d5f8febddd05b7f07d9a72d67760991
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. ClamAV and an ML classifier flagged the PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=what+are+the+different+types+of+cables+in+electrical PDF link annotation
    • https://siroxexorap.weebly.com/uploads/1/3/0/7/130739693/c36e30a2a73c.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/bavonugirad.pdfIn PDF document text
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/tedovudilaj.pdfIn PDF document text
    • https://dobabolomibela.weebly.com/uploads/1/3/2/6/132681713/zeritedoj.pdfIn PDF document text
    • http://lisolu.org/kelupuwuxaboposutofuvlsdnf.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/how_to_change_screen_resolution_on_dell_monitor.pdfIn PDF document text
    • http://stavki.link/95193974275iuhcc.pdfIn PDF document text
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/ledewisawoz.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/1fac9607c.pdfIn PDF document text
    • https://furadigiwib.weebly.com/uploads/1/3/1/4/131407367/03091e.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/efade7163.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/classification_of_plant_viruses.pdfIn PDF document text
    • http://padlamadla.site/the_work_of_art_in_the_age_of_mechanical_reproduction_summary_per_chapterw8omj.pdfIn PDF document text
    • http://sevastopol.sale/70381912666elc5y.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/zofran_davis_plus.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/c3da1fbc-4aae-48cc-9bf6-8d5903a0827a/how_much_do_emts_make_in_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52188823-a15e-49ef-908d-c5cf927f5b29/62257001708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d7a06b-6d1f-4581-8282-484e9a439cfd/2010_lexus_rx_350_blue_book_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb17099-1f5c-4406-abac-b036a4404d7a/sirexarimosipulaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a5f922-b41a-42b9-b717-4713145c91e7/el_ser_y_la_nada_sinopsis.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/a_midsummer_nights_dream_summary_act_3_scene_2.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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 5496 bytes
SHA-256: 87973afdd54d9bde5aa4f67240820862fd45cd47b59831daad5be2655fe8025b
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 10580 bytes
SHA-256: 869edbb44af2ece8905564f4ca2e643b80326daa4caa9a77f0f9bcfa4a4772ee