Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d2b67e42a0af6f…

MALICIOUS

PDF

73.6 KB Created: 2021-03-10 05:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81245162e5ee98a34b55629a2dc1cbc1 SHA-1: ad4d86d4209946727b4d9fb7178dcac096f51263 SHA-256: 79d2b67e42a0af6fa70dd59ef83563deacdace4932cd3f9e587f4556b0772ddd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('botokaw.ru' and 'instapriz.site'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=rotork+pneumatic+actuator+pdf PDF link annotation
    • http://instapriz.site/403313756487jy7o.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/KbgjjdB/geometry_defense_2.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/bqXjija/moy_6_the_virtual_pet_game_juegos.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/odisha_govt_school_holiday_list_2020.pdfIn PDF document text
    • http://goproonly.com/79331887006p55wm.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/43189723972.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/cakephp_3_email_attachment.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/how_to_get_movie_maker_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/hhdgh5T/game_buzzer_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/vjac4pk/latin_american_wars_of_independence_quizlet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_0899d78de29f47f3beedb25d5d716912.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/790d5537-a42d-45a5-9f1e-7b93a36f846f/3552480305.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_d8d13d203bc547d7b98bf38b95b2687c.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_35811bd695cf4c659698eb1d43ea911f.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_57963df434ce4b569956be9d35f74181.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/how_to_work_jam_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1386086b-28c5-46f2-ac30-2cdd8549649b/is_there_a_remake_of_the_shining_coming_out.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/marlin_model_81-dl-22_cal-s-l-lr_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec15ca6d-176e-4f9e-8a19-1fc9c89f6873/how_to_download_charlie_and_the_chocolate_factory_full_movie_in_hindi.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_4ad477ae4e9645aa88d3a7c3c212c560.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 5164 bytes
SHA-256: d397c91da7beb51c9d197617dcb0f0446ece7f439da13ef3f6fa8bddb124e3c7
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 11660 bytes
SHA-256: f4dab73793397e480d62cfdd9fa686cd7531a615e3afd25901296fdce5c5dfaf

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