Malicious PDF — malware analysis report

Static analysis result for SHA-256 c137f05981f06d71…

MALICIOUS

PDF

70.3 KB Created: 2021-03-17 20:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0c70fbc27f7959ecfdc9648485b93a9 SHA-1: ecd9bc13d2900e2b5a64320867b6657e1c5fd91e SHA-256: c137f05981f06d71d34b226c52d27b574c6355e85960bc2173597c648cfbd882
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to unknown or potentially malicious domains. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://maypoin.ru/wix?keyword=tv+guide+bakersfield+bright+house+email
    • http://1xbets-regs.site/24730952745by15y.pdf
    • http://zhk-rekord.info/what_are_the_basic_beliefs_of_the_mormon_religionz2ha9.pdf
    • http://ogranifruit.space/mikufubupujoba6fomm.pdf
    • http://santand-es.com/lemerigikultd6vo.pdf
    • http://fisuruwibowin.66ghz.com/nilowafowurabekimofe.pdf
    • http://wipunemobak.mygamesonline.org/agatha_christie_books_for_sale.pdf
    • http://vodabutopidaru.getenjoyment.net/rumawojo.pdf
    • http://flowerport.shop/adobe_flash_player_windows_7_64_bit_indir_gezginler5gl6n.pdf
    • http://feboxazatoran.22web.org/ala_baburao_marathi_dj_song_free.pdf
    • http://wativeb.mypressonline.com/fesebanegademudexipusoji.pdf
    • http://lorakuze.sportsontheweb.net/49395146712.pdf
    • http://thelandofbadideas.com/zaluzixx0r.pdf
    • http://hookup753.fun/rezatezazg3ens.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_205e145f049c4ddab2fd89c1c7667344.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_9b4e51d7cd7c49f6abace2d61d5129b9.pdf?index=true
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_54bb722f11dd4660ad05636ea5dc3a3d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e53533d6-7323-482b-a1b4-7435f7517954/nutuget.pdf
    • https://uploads.strikinglycdn.com/files/bd9845c0-7a68-4afa-8f64-d4a59eb607d6/fefubozokawakava.pdf
    • http://nabenejajoko.myartsonline.com/history_of_indian_art_book_class_12_in_hindi.pdf
    • http://zepizokuxufo.rf.gd/what_format_is_used_for_writing_a_research_report.pdf
    • http://xikufozumif.epizy.com/leatherworking_leveling_guide_wow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d303.bin
fd7933858ae8fb2a47fb535eda272950dbe974d6ce63534422788707116d5d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 5536 bytes
font_01_sfnt_off0000e5b2.bin
f6d73befda44ba67a742ccffb5f93776a35dc564f053e67bad02acee7c9e090c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 11200 bytes

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