Malicious PDF — malware analysis report

Static analysis result for SHA-256 82948941cd7ce1c4…

MALICIOUS

PDF

74.2 KB Created: 2021-03-28 06:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79d95fee2bbdd9dcb4a0200874677146 SHA-1: 5e73db19edde6f221e512e1d492d0ad59279f1e5 SHA-256: 82948941cd7ce1c44388f2c9a7e75a4461baf2fa3f7b576333cec91391fc44f5
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 0.9991

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://jottigo.ru/award?keyword=anaximandro+de+mileto+pdf PDF link annotation
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_60258fadcc7be.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuvusu/ijjhNje/ua_high_school_minecraft_pe_map_download.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/xesawif.pdfIn PDF document text
    • https://cdn.sqhk.co/ginonunujiji/mLeDcda/zilawulolezijajin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_603d4325acdc5.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/gd0jhhh/32528560581.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/e16f2d44.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/tejeropaxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_6056f66f559aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_60315a752438e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_60261c0b1d114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_603f6af477ef6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5fe2f7f0dcb22.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/bACjejb/gomo._ie_contact_number.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/0f680c5e-b972-4d9a-ae3d-849f2c2011c8/how_many_books_are_in_the_shade_of_vampire_series.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_b7d6873983964d50bd985e0b1b8870c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/791ac7c0-659d-4752-b5b1-5869ea40e48f/hindi_varnamala_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b08551-db9d-46ac-89e6-a650fbd2dd1b/reading_comprehension_third_grade_common_core.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd7a889-1db7-4c8e-bcc5-46fd501b7e52/bipap_auto_bi-flex_system_one_60_sries_-_philips_respironics.pdfIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_057e9b86f9a84f49837e8adc0df29382.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7d59ea-76c8-4fbf-91f6-65a26b43a92e/rules_of_tajweed_in_english.pdfIn PDF document text
    • https://869e45c2-9c2d-410b-ad52-4d3411d41339.filesusr.com/ugd/73bd41_5f41291bc91f45169011f1be61170bd7.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_008db9737479465a9df309a0aa1c0cba.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 5068 bytes
SHA-256: b91013e9d0cfb3cd4bb3006b4c9c17cefa5dd7fb4e275bb0a98f714ea30e0f8b
font_01_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 11368 bytes
SHA-256: 19963d410f9f1a8934b35ec9b3df3e578ea9010ed8a8132635a6ce9982caf0e5