Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b29db964baeb2a4…

MALICIOUS

PDF

74.2 KB Created: 2021-06-06 08:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a63ced70982d85c2a4e66ae4df1e7a7e SHA-1: 259e589edfa1e3e66276b5ce30fde77f03ed166a SHA-256: 6b29db964baeb2a47a7f2cadb06842de5f52ca653e32950c0cd12f64df325d00
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, with one directly leading to 'https://allytemp.ru/pbw?utm_term=law+of+conservation+of+mass+worksheet+answer+key'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://allytemp.ru/pbw?utm_term=law+of+conservation+of+mass+worksheet+answer+key PDF link annotation
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/5e70167.pdfIn PDF document text
    • https://fumuzajel.weebly.com/uploads/1/3/4/5/134588097/6072907.pdfIn PDF document text
    • https://banijeweziwi.weebly.com/uploads/1/3/4/8/134873891/madurek_tusegiz_fomasiludololi_lazarufapanoto.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/2539437.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/f1ed23d7-ca91-487c-b08d-2029a7ada62e/62250151140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4253bf58-510f-49ed-b3d5-a03943323b4a/2637437527.pdfIn PDF document text
    • http://lefilep.pbworks.com/f/how_to_get_whisper_of_the_worm_catalyst_reddit.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/noxenuwomexobavukituma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b939a2a4-3cc2-4200-a13b-593894926794/fl_studio_12_free_download_for_android.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144457677/what_does_service_start_stop_system_mean.pdfIn PDF document text
    • http://guwodav.pbworks.com/w/file/fetch/144710601/vitixigexatoloduwimijame.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144521169/sujet_brevet_physique-chimie_avec_corrig_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ea83be-74e9-49a8-89dd-253d9950a5d9/surfboard_sb6141_lights_white_not_green.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e46e0e2-dae3-4213-877e-7a7c6257c335/7237015235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04db2de8-4d3f-40b1-8aab-04f123895f70/jakefufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8c5bf7-09c4-4348-b233-613b10288b0f/4020073070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314746b6-bce8-4096-89b3-cbfe5a3f07d9/lobejirawebumalofage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109a7aa1-16f8-4ac2-8e74-21b4c70aeb1a/zosisubozoka.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/how_to_cancel_brinks_security.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69687df-3424-43bc-aebb-c05d86d8d737/matrox_monarch_hdx_utils_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29df398-b129-4ac8-8059-0e3a4b469390/washington_football_team_trade_rumors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b692cf0-0074-4530-865e-876e12a39b15/haier_air_conditioner_filter_reset.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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 5348 bytes
SHA-256: 69d7b5d68719024c6bde1b05c9704b300d414cd35e8579bd328b85ed35b2279a
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 11132 bytes
SHA-256: 1c8535ff7e8b7ff467b058a137c890cd0ec3323c68afac77131c28f2f4ffd693