Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b39222596b64da…

MALICIOUS

PDF

88.5 KB Created: 2021-03-21 00:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1776a090f52eec385226bc86e18ed7a9 SHA-1: a32f39a384806b407385820a18dde294170299bc SHA-256: 25b39222596b64daff64310c6eca7ce48012f9585929c789b9dc110d4dcbdb18
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/aws?utm_term=caballo+de+troya+estrategia PDF link annotation
    • https://cdn.sqhk.co/wemowubire/A0gfIBV/popular_hashtag_instagram_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/kiijfLS/first_words_age_5.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/how_to_write_a_song_on_piano.pdfIn PDF document text
    • http://bilet-pdd.site/pompeii_ruins_map1fr4f.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/MUnPUif/cape_landform_drawing.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/meterpreter_commands.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/85104171415.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ctGIGIk/closed_cell_cross_linked_polyethylene_foam_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5feaee877d118.pdfIn PDF document text
    • http://numulul.mygamesonline.org/fur_elise_piano_sheet_music_free.pdfIn PDF document text
    • http://azalea.store/maxi_cosi_mico_ap_limited_edition_isofixofm7f.pdfIn PDF document text
    • https://cdn.sqhk.co/nabaxifow/EgcCigX/73466774640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_604cc84063733.pdfIn PDF document text
    • http://usesalle.xyz/vovamifijutitifewadhwyux.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/dasizirexozatili.pdfIn PDF document text
    • http://procripton.com/fowutekusomupavelefekifiv9sja3.pdfIn PDF document text
    • http://test123test.xyz/where_change_transmission_fluidj0651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifeloj.onlinewebshop.net/credit_risk_management_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb96a39-fbb6-46a9-ae2c-6c4a302bb481/how_to_use_vicks_vapopads_in_vaporizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3372103-c8a7-41bc-a643-64a014684754/who_services_heat_and_glo_fireplaces.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/cutting_edge_intermediate_resource_bank.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/xemotakip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cb5b8a-92b0-4604-8947-e0882a2aeddf/66913764236.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 5140 bytes
SHA-256: 9565c8da2c9ae913adf2137ea0fb17849cbb5d38fdbaccf598c04a7364619776
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 11552 bytes
SHA-256: 33163f947e6b299c3e55e982cd7074cc6f8aba25b16edde55e431a754941ce0a
font_02_sfnt_off00013db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB8 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd