Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfbe2b90d1a61b6…

MALICIOUS

PDF

77.6 KB Created: 2021-06-02 02:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207534b49cf2307d6bfb5ddb038cf5b8 SHA-1: 5b2adbd4f5fc1e39c061ebea6d677396c4395a0c SHA-256: 5bfbe2b90d1a61b6c08462a1d24a73530d293c0e4ff49f24ea818b3129ac20cd
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links. One of the embedded URIs, 'https://crewmak.ru/pbw?utm_term=can+you+use+an+adjustable+base+with+a+hybrid+mattress', and another linked PDF, 'https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/zosilisutox.pdf', are suspicious. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the overall structure suggests a malicious document designed to redirect users.

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://crewmak.ru/pbw?utm_term=can+you+use+an+adjustable+base+with+a+hybrid+mattress
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/zosilisutox.pdf
    • https://cdn-cms.f-static.net/uploads/4530457/normal_602bb02f1f21d.pdf
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fdf56a49b4de.pdf
    • https://static.s123-cdn-static.com/uploads/4476595/normal_5fc6cd3a0c84c.pdf
    • https://static.s123-cdn-static.com/uploads/4443624/normal_5fffe130cc49e.pdf
    • https://cdn-cms.f-static.net/uploads/4394061/normal_60531e799bb66.pdf
    • https://vudivopaf.weebly.com/uploads/1/3/4/8/134876542/kodugewaxesag_zonitaz.pdf
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/86655c8f.pdf
    • https://vimawagugagepa.weebly.com/uploads/1/3/4/7/134732412/2033bebd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/31cebfa1-8d4f-490d-8afb-346ecc703385/thank_you_maam_internal_and_external_conflict_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/f7895a9c-55d7-4a5b-8a92-4eccbd26eb35/ingersoll_rand_air_compressor_r160i_manual.pdf
    • https://uploads.strikinglycdn.com/files/85cd0885-7c32-4de8-a8f4-ebdb603e9b6f/30029474366.pdf
    • http://wefolevemud.pbworks.com/w/file/fetch/144481086/ticket_to_ride_europe_how_to_play_video.pdf
    • https://uploads.strikinglycdn.com/files/bc825c04-8e1c-4577-85ab-b31f9103adcc/12319623897.pdf
    • http://sorawako.pbworks.com/f/the_norton_anthology_of_american_literature_ninth_edition_citation.pdf
    • https://uploads.strikinglycdn.com/files/9d44900b-bb0c-4dd9-9d5e-29e3a6ccf4c4/how_we_die_by_nuland.pdf
    • https://uploads.strikinglycdn.com/files/e33a9964-87e8-4938-a5f3-dbbf04ecf7bd/lorikazaboponagur.pdf
    • https://uploads.strikinglycdn.com/files/05ae9a9c-30f1-4899-87ae-3970c7ecbaf6/6570651539.pdf
    • https://uploads.strikinglycdn.com/files/f3bace6d-7cd3-41d6-ac5e-acaf99900980/73052584765.pdf
    • https://uploads.strikinglycdn.com/files/23f74446-06ae-49ff-8e01-526eeb7c4b82/53883522123.pdf
    • http://zepadatoju.pbworks.com/f/78383415293.pdf
    • http://nosiravuga.pbworks.com/f/cognitive_behavioral_therapy_for_ocd.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_off0000f04f.bin
23651a89351fc2f21dc0e87fc64e6bc45c25d813a039cdcd2bb861c206d05f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 5380 bytes
font_01_sfnt_off00010282.bin
9bf0966e24b584f502304e96659b53a19deb1ab211456f33d847ef5b17a03718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 11312 bytes

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