Malicious PDF — malware analysis report

Static analysis result for SHA-256 da461caca2cefddc…

MALICIOUS

PDF

77.9 KB Created: 2021-04-20 00:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c7a7d8b2c3ad358dba08f79903cbb638 SHA-1: 1db3d2e80d70e5ab2c5e8778233a628fc245e9f4 SHA-256: da461caca2cefddcf6b9005c703a9d815c24da4555e965043867c1538fb307c6
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one prominent URL suggesting a phishing lure related to a "porter cable nail gun jammed" issue. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. No scripts were extracted, but the presence of numerous links points towards a campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=porter+cable+nail+gun+jammed PDF link annotation
    • http://rijoginijamibeg.mypressonline.com/fivomuvukun.pdfIn PDF document text
    • http://javoreruja.iblogger.org/79867425810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_605cdcf71e9c6.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/iaqRgeF/fakatiwebuxi.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/pireximiruxun.pdfIn PDF document text
    • http://rugavup.iblogger.org/holiday_green_day_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_60263eca3f2a6.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/iihfeje/wasazutilevitoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409110/normal_5ff24f782bd41.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/gmjagjh/mycbseguide_class_9_social_science_ncert_solutions.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/alcatel_pop_4_plus_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_e4f40b40ab5f4198b65340816c0f368f.pdf?index=trueIn PDF document text
    • http://tameladizikep.atwebpages.com/being_there_download.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/tibuze.pdfIn PDF document text
    • http://kozolamo.rf.gd/kisexefajolonubegol.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_831b1ee85897477385caf26d36e33207.pdf?index=trueIn PDF document text
    • http://rixojitudoj.rf.gd/65602324064.pdfIn PDF document text
    • http://bagineju.epizy.com/identifying_sentence_fragments_practice_b_worksheet_2.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_3c108b0d05a84f66ae80e9b6fcafb739.pdf?index=trueIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_b4e4d5ff5b0a4ce286893e2b8406e1c8.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_2c81c5f17ad2455191b668fec31aba5f.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_243fa9a622e9453cb060f32c221d4023.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_bf6644d084254735badb47460a1fa873.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_cd557a3124e84011aebbd71bfd88e1de.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_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 5296 bytes
SHA-256: 7aef00f117bc07ff6098ce8c70dd1c302b7d0f16e7fae1b9638f034cd8ffb853
font_01_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 11228 bytes
SHA-256: 6245eee5db86bf4bb61a5f66263ed387c9b77e6857ed25bec12ff4238dd806b2

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