Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5740f6bf3154a9…

MALICIOUS

PDF

83.7 KB Created: 2021-03-20 01:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 556afbc1212d71b327f7d199ef27ef6c SHA-1: 58c4b505598c9b320747193f1adc5b5ff64d691d SHA-256: 6c5740f6bf3154a98b1e1ecaa28df415c9e7c40c684873a5e13413ef656d1b87
74 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The document body, though heavily obfuscated, suggests a lure related to a 'formal reference letter template'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=formal+reference+letter+template PDF link annotation
    • http://domainlimax.xyz/purapajurukunenikekanopiu00k3.pdfIn PDF document text
    • http://giocodigital.fun/why_does_my_cordless_phone_say_check_tel_linegcbos.pdfIn PDF document text
    • http://lofitner.buzz/bow_tie_cinemas_saratoga_wilton_mallwlz62.pdfIn PDF document text
    • http://marinarus.space/218518554477z6qc.pdfIn PDF document text
    • http://hotita.space/ornament_and_crime_manualel6cl.pdfIn PDF document text
    • http://musofiron.ru/xoxeketomekerexisonarjaxlo.pdfIn PDF document text
    • http://instasale.company/95928145185bnbki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_6050cfe7a7d6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_6007cafd76151.pdfIn PDF document text
    • http://uaregroup.com/is_romeo_and_juliet_really_a_love_story8d24h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizimup.epizy.com/nukibitalovuxit.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_34b08b5c767a4c8b8929db8c9ee48b8f.pdf?index=trueIn PDF document text
    • http://gonuzalujulogab.rf.gd/happy_birthday_telugu_movie_songs_free.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_a6f3572b44124dd2bb3b86bb58504ff2.pdf?index=trueIn PDF document text
    • http://fojigexojapox.rf.gd/25925776763.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_5ae8800ea76c4958a30ef48b85c37d89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f47ab16-f53f-4892-850d-974b47dc8498/41225976922.pdfIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_cf5bb62a988b4a7f91d0a16375ee7669.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d848f415-1daf-4136-9898-bb1eff7f78b3/crazy_rich_asians_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb222bc-7fee-4b40-ba68-e65ebb65eb49/how_to_use_brain_power.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_b10c6be7ae0748aead07914de21b572d.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_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 4936 bytes
SHA-256: 89eee8b0123ca862aebecbeabe025b969698eb94d61349e5fc26b14e9a0d2298
font_01_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 10968 bytes
SHA-256: 6abdadafe69a51f50bf730deac6c3112ec4a7cc2f418f1a2e3aadbca7a44f15f

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