Malicious PDF — malware analysis report

Static analysis result for SHA-256 d900b0390f373168…

MALICIOUS

PDF

75.8 KB Created: 2021-05-19 00:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 39f32d3c2b22078951ea245f1aeb2585 SHA-1: d20b6c8cd2630b5d9c73d77d9792c05dfaa6468d SHA-256: d900b0390f373168359798f339bf04baa24c8229aa3f2ac9d345c77880cc1390
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. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. 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 0.9993

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://bologen.ru/strik?utm_term=what+are+the+16+regions+of+ghana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6014734e70087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_60653817e938c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_600ca5e95639b.pdfIn PDF document text
    • http://sefefiwa.22web.org/calculus_by_thomas_finney_10th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_60571ffc03e2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_60099dae0bd9d.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/c40872af-9eaf-48dd-932e-050df3b0c611/where_is_the_power_steering_reservoir_on_a_2010_chevy_malibu.pdfIn PDF document text
    • http://zozezofi.rf.gd/sole_elliptical_ratings.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/94928545429.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/how_to_configure_nanostation_loco_m2_as_repeater.pdfIn PDF document text
    • http://tutufot.rf.gd/deadpool_comic_face.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a10b5f-61fa-4f7a-b913-8dec265ecb92/waxitufimifotepazilolorof.pdfIn PDF document text
    • http://zapuwoz.epizy.com/dbt_worksheets_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0f7ff5-3a28-4054-a63c-f2dcd1596057/how_to_stick_weld_metal_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37098e31-71d6-4a3c-84cc-80142a7ac63b/how_much_should_i_pay_for_graphic_design.pdfIn PDF document text
    • http://pitafexe.epizy.com/where_to_drop_clothes_off_for_donation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb880a08-1c4c-4e0d-84fc-a7b9afe92f72/mesa_boogie_dual_rectifier_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240563b6-697c-4eac-9fde-c379e94694e3/besum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6dee31-56e1-49d7-b386-11139779f66e/honda_hrc216_mower_blades.pdfIn PDF document text
    • http://gatadijimog.rf.gd/lebokiruziwawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad965f1-584b-4766-beac-5938f08b4c8a/wonufozutekidegabenaz.pdfIn PDF document text
    • http://tokeparab.epizy.com/what_is_the_symbolism_behind_elephant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4f2979-5228-422e-aec8-69b077f745e9/59796559883.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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 5216 bytes
SHA-256: 7960e6af6655b86ebc3a474ade26a0c675a18129f212b590f56873845ba6b576
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10896 bytes
SHA-256: f21241f377ddc06fc138f218ee79d8ff85fc59d2f15120b30727872824abb771