Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a57b93e7422d58e…

MALICIOUS

PDF

78.7 KB Created: 2021-02-21 08:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 36d2549fef9800e54234135c27f4957b SHA-1: 48c70224bccf69b00a25dc757264829f956648f5 SHA-256: 2a57b93e7422d58ed7da03093823d150d131693925b8f6a2472cd77e67b788f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The embedded URL and the document body, though heavily obfuscated, reference "John deere 265 mower problems" and "wkhtmltopdf", indicating a lure to external content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://baarspo.ru/strik?utm_term=john+deere+265+mower+problems PDF link annotation
    • https://cdn.sqhk.co/zufosupiz/EUVITic/linear_equations_calculator_matrix.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/ihiFidO/run_rate_calculation_power_bi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385198/normal_600886dd71537.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/0sgfcOg/31384071060.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/dcjjiha/vepajulugisejudulakidada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_5fd905885cfc6.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/MlHddgd/mutefomelobawugevanawol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_6031dcc7b3561.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/GhaVjcM/hill_road_construction_games_dumper_truck_driving_school.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/F7ifFmG/english_song_lyrics_for_caption.pdfIn PDF document text
    • https://cdn.sqhk.co/bumegukomuza/8Y9JicL/50616724543.pdfIn PDF document text
    • https://vedatirujoxe.weebly.com/uploads/1/3/1/6/131606280/9389060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fde9d8c5b8cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/46391639473.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/forces_in_equilibrium_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/the_giver_movie_vs_book_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/giwodiwagaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/gisujudubonamixiwuxeraz.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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 5620 bytes
SHA-256: e4a1c32f0c221b67716d12fb4addd39ab9087d90e444e4d577f99e36ed9805da
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 11128 bytes
SHA-256: 3afb03c14ff8670fa2e319fcb4a00f1317d7daa231b6e9e4974f87291d8901f1

Open this report in the interactive analyzer, or submit your own file for analysis.