Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afb3c980a8c46fd…

MALICIOUS

PDF

86.7 KB Created: 2021-02-20 09:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8de9d00634f8ce64fa622158102324d9 SHA-1: d149a84f7fdcbc1782af6d4982a921a658fee0c4 SHA-256: 6afb3c980a8c46fdaed8a4bd7c6a094de013e8ff1d19d699ac6737b14b07dd85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=how+to+calculate+manpower+requirement+in+manufacturing+in+excel PDF link annotation
    • https://cdn.sqhk.co/xafigozenusu/je3hbhb/flavo_rice_seasoning_recipe.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/kibagesofarosajifebutiwaktuqj.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/c4ge4ig/vebiwimedifijug.pdfIn PDF document text
    • http://good-production17.site/cool_car_racing_games_free_onlineirack.pdfIn PDF document text
    • http://kijomino.iblogger.org/29769551409.pdfIn PDF document text
    • http://pitushok.fun/sandworm_bookey8my.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/bibj1ij/72670821414.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/4Spgiie/spinal_tap_test.pdfIn PDF document text
    • http://dkmz1.club/5462643629j2b10.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/f2geOjf/best_twitter_app_ios_2018.pdfIn PDF document text
    • http://unlockdeals.shop/2009_jetta_2.5_transmission_fluid_changedig4x.pdfIn PDF document text
    • http://daliadiago.com/33704872063s5s0i.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/gcif0Nr/dog_sim_online_turbo_rocket_games.pdfIn PDF document text
    • http://websporizle3.com/ingenuity_baby_bouncer_washing_instructionsei5h3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopuperoki.epizy.com/39178047499.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/58220108411.pdfIn PDF document text
    • http://jabenesejamuji.rf.gd/semiseki.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/baby_bjorn_air_carrier_manual.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_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 5404 bytes
SHA-256: f253c4cff149ec970a50a6e2e9686ea87a122de893ff3ea5bd6e7274815f127a
font_01_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 11464 bytes
SHA-256: e09548b210af9c7a09a1acc8b19522a4d1e6cea170f1181d9704682529a409be