Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9366d03de9e61e…

MALICIOUS

PDF

68.4 KB Created: 2021-03-05 15:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87a4d010fa71871d2f1f2fa5193b981f SHA-1: 9937bf7eb0de6edbcea7fdcbe2082b5110dc0038 SHA-256: 6f9366d03de9e61ed6e8c06b7ca1ca16ca5d81e993f6123febbe7268f8a58a92
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 0.9998

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://jottigo.ru/strik?utm_term=how+to+use+stealth+cam+sd+card+reader PDF link annotation
    • https://cdn.sqhk.co/kakovavop/faLhaid/xikikexaxolovofeno.pdfIn PDF document text
    • http://begokawepene.22web.org/84207224624.pdfIn PDF document text
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/44053.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/esicHgg/best_classical_piano_songs_to_learn.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/wirepazav-jebetob-fumati-vaxiti.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/icZjaAh/game_of_thrones_cast_season_8_salary.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/kawafuparofogoj-xoxudim.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/livasafatibesoba.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/fexobe-zibomapanajobi.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/c32a65f2edc.pdfIn PDF document text
    • http://kawolamekepe.22web.org/invent_your_own_computer_games_with_python.pdfIn PDF document text
    • http://fodokimi.22web.org/printable_cursive_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/mitavuxoke_rulepuxejerital_xikako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/vawabesulilew.pdfIn PDF document text
    • http://soreras.epizy.com/ap_download_centre_www.123smartsport.com.pdfIn PDF document text
    • http://nurivab.rf.gd/54898583976.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/que_medios_de_comunicacion_existen_actualmente.pdfIn PDF document text
    • http://tonezifimoraga.epizy.com/digakuwa.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_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 5232 bytes
SHA-256: 4321974d02cee901fe7b6d583b2ea58b69cfbd9b948acfbcd0398232ed23eab3
font_01_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 10240 bytes
SHA-256: 1a1714625a9753158da87b76e577b38f67a917319d994be44d93ab579babb000

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