Malicious PDF — malware analysis report

Static analysis result for SHA-256 653f2ebb6435a301…

MALICIOUS

PDF

77.3 KB Created: 2021-04-28 14:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 48a7fce16d66fb9172d25c8843a897d8 SHA-1: 59a97ae0c96ae185fff58d6138949ec4c3070730 SHA-256: 653f2ebb6435a301c0024eb936afae89f619a832afd45dd789dd8bd1bdc4caa6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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/strik?utm_term=accu+chek+aviva+plus+kit+contents PDF link annotation
    • https://cdn.sqhk.co/putizimetiwe/oIs9hhv/55721547035.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/jahfghK/kumivogofajexetobiw.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/BPDCcja/power_rangers_legacy_wars_mod_apk_obb_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/fLhfhbH/47098555439.pdfIn PDF document text
    • http://pelaberofusej.iblogger.org/determination_of_surface_tension_by_capillary_rise_method.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/B1pjff3/monster_battles_tcg_guide.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/pengertian_angiospermae.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/gjhgugg/goat_simulator_mmo_simulator_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/dyQqjbw/cheap_homemade_teacher_appreciation_gifts.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/hjihjcC/dining_room_set_modern_farmhouse.pdfIn PDF document text
    • http://bas-vorota.ru/19351109810tvk3d.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • https://cdn.sqhk.co/buwisotubu/huhi556/78469629428.pdfIn PDF document text
    • http://vandify.com/all_american_slurp_plot_diagramuwey6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipeporo.onlinewebshop.net/xewimovozefejosodix.pdfIn PDF document text
    • http://gorulilul.rf.gd/the_leftovers_episode_4_season_1.pdfIn PDF document text
    • http://forarit.epizy.com/solving_equations_with_fractions_and_decimals.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/review_of_capital_structure_theories.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_b6aeddfbbfd54a699ab6c1f156c45a30.pdf?index=trueIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_7e09c16d7af54f9ca0b1d160dd189b0e.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_0ea7f36c573f42ce9f8112541ff465f4.pdf?index=trueIn PDF document text
    • http://rexelipenaporux.rf.gd/laguzirusokafot.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_28b17182b7df4f7aa4d40e7f3325ea4f.pdf?index=trueIn 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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 5040 bytes
SHA-256: 15ba742345136c482910b62aebe8dfe37bd462217d756cc6d6cdb4e31172cc75
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 11312 bytes
SHA-256: 5eb3a441b2062ede027d8be60aead08fc25cf2af455994605e93e782f76e1c7d
font_02_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501