Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97c1d0e93c7fc64…

MALICIOUS

PDF

75.9 KB Created: 2021-03-29 15:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d108a41ac6e9b224dbf92fd64993bff1 SHA-1: fdaaa5bc2f08d3c34203bb79c97171a304398bfa SHA-256: b97c1d0e93c7fc64b5f4e04360415ce50fceecfa4e31ac52c93437dd1aa18e26
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

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/wix?keyword=risk+board+game+instruction+manual PDF link annotation
    • http://bobiruropiles.22web.org/42393150089.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/4BhhigZ/cops_n_robbers_2_jailbreak_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/hcihegd/32633725716.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/uwifw0E/skyrim_elder_scroll_dragon_id.pdfIn PDF document text
    • http://pozorigedaxepi.iblogger.org/rexikanudozidorokinuvo.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/jixerubowi/1st_battleship_squadron.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/factoring_quadratic_equation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/salirelekidodudegusetuxa.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_5e59b04bdf484ef59b3f49d62ae66bbc.pdf?index=trueIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_c87af0c0b55540558984271073d3b779.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_d4c1285b8871448cb0a98751f5d2df22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/how_to_resolve_conflict_in_the_workplace_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/what_games_are_compatible_with_nintendo_ds_lite.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/what_is_the_best_radio_cd_player_to_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/gututakesonijuregikuno.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/bodoni_book_italic_font.pdfIn PDF document text
    • http://xubudexev.epizy.com/59478638833.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_c34b39739aa14e52a64262de7359f665.pdf?index=trueIn PDF document text
    • http://sasebuza.epizy.com/backtracking_the_human_condition_summary.pdfIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_f343f1b847db4241baec0aec37f77ca5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubeto/118908337.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/how_to_actually_lose_weight_at_the_gym.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5472 bytes
SHA-256: bf88d15912428b15576664f89769304d63911f5d1ece34e54b851e055575c519
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 11416 bytes
SHA-256: 57e1ccee4715e512829351f33b3f53f494eabc26a3c076eb950e26d6046a5601

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