Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3110543e4406d57…

MALICIOUS

PDF

81.3 KB Created: 2021-03-15 10:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e55f83dae83ed26e68c1c38976f4d614 SHA-1: c6d8b4265abfdcff7d7e8130109585a99bca95a6 SHA-256: d3110543e4406d57e3d991e5dfc90b669559e02982446132eb5723cf26be40ef
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a primary focus on `https://midufefew.ru/award?keyword=schindler+s+list+piano+sheet+music+free+pdf`, suggesting a lure to a potentially malicious website. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=schindler+s+list+piano+sheet+music+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365551/normal_600b592c04cfe.pdfIn PDF document text
    • http://befemuvejizu.22web.org/waxusejukawogajivovumisuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/dUhgWjd/castaway_cove_waterpark_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/BTSogfY/radiant_heating_electric_vs_water.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_604a4c013e6f4.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/Eiha4zn/mivifizegixezita.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/EVBZljh/94213482322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwegovufa.epizy.com/gallbladder_polyps_treatment_guidelines.pdfIn PDF document text
    • http://moborudazijom.epizy.com/25723105115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffef075-1add-40ba-9a36-3aa130d237a0/padotivafivujudipumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebafa45-9728-4fb5-b35d-cb1a44d88457/what_is_the_theme_of_the_poem_still_i_rise_by_maya_angelou.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2ecf4d-d699-430c-934c-a88a0fdc5aeb/how_to_calculate_the_impedance_of_a_transformer.pdfIn PDF document text
    • http://zugarig.epizy.com/zudokaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d831d326-6ea4-4bb1-b4bd-c5250ab182db/3267732915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73386b35-0421-4cf0-86cf-4f797700a0c7/how_will_you_measure_your_life_quotes.pdfIn PDF document text
    • http://sixexelotu.epizy.com/95058374311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ae5ab8-8346-496c-9ecb-d29de5ca8f57/irobot_roomba_e5_wi-fi_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b59a5f4-8b32-408b-9185-f76f50c35260/how_to_read_percentile_ranks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c6d7c6-2815-4f52-a950-c65216d6b840/pixawimoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e1f699-4d21-4294-9b58-b660f87a485d/wifoxetotebapa.pdfIn PDF document text
    • http://ziwilud.epizy.com/opgeslagen_wifi_wachtwoorden_achterhalen_android.pdfIn PDF document text
    • http://ruludamena.epizy.com/benumof_and_hagberg_s_airway_management.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_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 5500 bytes
SHA-256: e06cd53af84b4b6bdaaf3450c6d73b89de142f7222676369cf3725a4b459e989
font_01_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 11940 bytes
SHA-256: 0c95cc6930dae7fb516c7eebd19dcd2e1f82c9a26512d71d290ecc0852cebc93