Malicious PDF — malware analysis report

Static analysis result for SHA-256 754f421a75468d1d…

MALICIOUS

PDF

85.9 KB Created: 2021-06-05 11:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d0840666b5395401549cd871dc6954cc SHA-1: 3c2adc211bce70a6f788cc4fccf54a78376f7385 SHA-256: 754f421a75468d1df122bc14602de5c908f35c063bfad5552f249dfe35afb2b8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The primary URL, https://baarspo.ru/123, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=bipolar+2+dsm+5+pdf PDF link annotation
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/18848.pdfIn PDF document text
    • https://boxudeso.weebly.com/uploads/1/3/4/3/134320939/3f49a7093919f8.pdfIn PDF document text
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/200ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://natizasex.pbworks.com/f/how_to_turn_a_into_word_doc_on_mac.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/what_is_the_difference_between_g502_and_g502_hero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4ddc6d-76ae-49f6-9f8c-b4037fff7ace/35498357873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03fc6bf-dc4d-4e45-b352-1c7b2e52b641/manual_chery_face_portugus.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/70643022643.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/67302094341.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/assassin_value_list_2020_february.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144524757/bukoturipafojirezep.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144520959/why_is_my_primo_water_dispenser_dripping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f245350-e988-463e-b559-b332a9361837/67593045080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78575ac-dff9-4d31-a9c8-4b21170bc4c7/diketigaw.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/kathryn_kuhlman_books_free_downloads.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144522183/7___2.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144625590/novipuxeminometisiguje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0404572a-c48d-440d-bcc9-91f584ccb0c4/2004_lamborghini_gallardo_engine_for_sale.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/f/58530727516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d6671a-3d41-4c31-ae14-c538534e046c/21472159532.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/bexojalikesuletisog.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/famakasuvotodibolu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 4976 bytes
SHA-256: fad52eb84ce81352c2a14f329f77b66eabb10541a2a8250ac15918faa8240ff3
font_01_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 12684 bytes
SHA-256: 001710ec5a3babd4d8c2a4ac645968871e21f5fe6d3d86770688e6699f4e5322
font_02_sfnt_off00013bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230