Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46f3cac925c860f…

MALICIOUS

PDF

68.7 KB Created: 2021-03-05 09:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 25d95fb185c5d625583546a2a8793978 SHA-1: 278a980766e122649c42590197dd7b3b7dd335fd SHA-256: c46f3cac925c860f44ba28461b7dd8093dd0978e4e2222b6b4918907ae955ee1
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of numerous external URLs, including those on disposable domains, points towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/award?keyword=angelcare+bath+support+grey+baby+bunting PDF link annotation
    • http://padlamadla.site/health_and_safety_at_work_act_1974_exampleskrg5j.pdfIn PDF document text
    • http://seomagnat1.online/mastering_skills_for_the_toefl_ibt_a4dqx1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_60268a74d735d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5fe226c981319.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/wotevutikelokimipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_6035d7cd9a9ee.pdfIn PDF document text
    • http://hangzhoumetal.ru/all_tenses_exercises_with_answerspoeto.pdfIn PDF document text
    • https://luvunamuzem.weebly.com/uploads/1/3/0/8/130874488/8384553.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/fezunuxe.pdfIn PDF document text
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/zurelutanusapag-vosewogiw.pdfIn PDF document text
    • http://good-production9.site/what_is_the_law_on_breach_of_trustpig69.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/5941a976-9572-4686-9181-ba363f49f501/keroperokajokudoviweba.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_b4fdb5f882ca4d9cabeec44ff8f1d26e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f649640a-b2da-4f92-ba44-4049c7363fa5/bell_hooks_engaged_pedagogy_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6218e7e0-3011-4ae5-a860-a59cf81adaba/what_is_the_voltage_on_a_riding_lawn_mower_battery.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_4f4883c13b16445eb12ef39017df87f2.pdf?index=trueIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_f2d162c9591742abae51b349587034a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/749933cc-a736-44de-96b1-c572cd492567/43980427800.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_b04143f2fb904f54b881ec65fd96288a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/501b1b27-570b-4b05-94be-b755e8dfbe40/58502201195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322f9ee4-9ea1-4582-9070-e3a65a7b74d9/how_to_file_illinois_state_taxes_late.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_36dc541a829b45d7b8a09b9268b8c02e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d6da3f-496c-491c-9c8e-85aa9909bfc6/simplicity_snow_blower_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c861c8-aa7a-48d3-8625-8542da8fee30/nuxidixirubukanux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805afe30-f64a-44f9-98e4-2c72735f09c7/13624691338.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_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 5428 bytes
SHA-256: 93014a94db972a3ce2ba8c69acebeb0abb4a42bd384081b1431d90f200169918
font_01_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 9752 bytes
SHA-256: 04ef0526bcaa9cbe2355ee21db4de9218c27b25062f32997eda0deb2cc0cc3ce