Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b8e3a92e75220e…

MALICIOUS

PDF

87.1 KB Created: 2021-05-13 14:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b6b4aec7ffb241f28d60e1b8546e8633 SHA-1: 5a80ea2f5998c21b54a7a397a7d0f33a2b0b5f9c SHA-256: a8b8e3a92e75220e2dabb8b674e0282067f11a5ad6e893e032d1161a2eabade8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'Attack on Titan', likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://leonvi.ru/strik?utm_term=attack+on+titan+movie+part+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425533/normal_605529c0ba6ef.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/icDbCrO/smashburger_near_me_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/ggqkCjc/96755966336.pdfIn PDF document text
    • http://bovakepixoworax.iblogger.org/jojedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_5fdc5386972dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_605f807503d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60282b503f8cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_6069e1113ed18.pdfIn PDF document text
    • http://loberas.22web.org/jabesazuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_6041c4b3cd385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_603861cc61c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_6044d1893f095.pdfIn PDF document text
    • http://wopurijosepi.iblogger.org/agenda_meeting_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_606dcf06e0c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_6064e1c48fa0d.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/Rjjiajg/wavujatoxosipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakuzubexur.rf.gd/wejaxepakupikosomirozeru.pdfIn PDF document text
    • http://nebabujomubup.rf.gd/binomial_theorem_class_11_important_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef8de3e-2660-48bc-a02b-50ac89d6649c/how_to_calculate_future_gdp_per_capita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bd7fc5-44ba-4c32-becb-1f92d0253fdf/zte_z222_4g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896177fe-5467-4ead-932c-954284e676a8/fodisovapeguxabudomon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81627bc-a105-49b5-971f-06ad38bbb217/fisher_paykel_refrigerator_red_light_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede85aa7-72a2-4653-9aff-9f7013cd7b13/86644369974.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 4804 bytes
SHA-256: d930ec983e5574308fffe53ea04e8081fbc2c3f94ec6501cc19e53286b836c61
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 5116 bytes
SHA-256: faa389a6e8238e029640075742db67348132f6308c2c161a42056be151623dde
font_02_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 18872 bytes
SHA-256: dab1a00e3391a5e8ec8f9b3cd8388b7569a0d1f8a937a9e9ba32db5998abb3c5
font_03_sfnt_off00013809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13809 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550