Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ea994a63e89be0…

MALICIOUS

PDF

75.7 KB Created: 2021-03-17 20:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb69ae9afebe0161343d0281522253b SHA-1: 4bc03ad4ef43a476a565d26abd87e4e1e79323d5 SHA-256: 43ea994a63e89be03560df27b8dddb3e40006b802a35d32efe61d1fc00b81c2f
96 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a link farm, indicating a large number of external links. The primary external URL observed is `https://leonvi.ru/wix?keyword=hellboy+rules+pdf`, suggesting a potential SEO manipulation or phishing lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=hellboy+rules+pdf
    • http://puwonasomoso.22web.org/92329771553.pdf
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/zumew.pdf
    • https://jakuxibakamu.weebly.com/uploads/1/3/1/4/131407414/vokopejokikoxabom.pdf
    • https://cdn-cms.f-static.net/uploads/4472793/normal_602922b0af9de.pdf
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ffcefdad7a55.pdf
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcdf82527222.pdf
    • https://cdn-cms.f-static.net/uploads/4495271/normal_6035c16f17151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e21d4bc6-674a-4c47-ae41-1ad7b768675e/33155232992.pdf
    • https://uploads.strikinglycdn.com/files/1236b619-576b-4561-a0af-57adf39cf0bf/46599491074.pdf
    • http://nototen.epizy.com/fukofapel.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_bdd66d3f01f7440883c135d724bf7386.pdf?index=true
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_8407a70e52054abeb2cf809f66b45728.pdf?index=true
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_8de77cf677c3415fa56da889c29af811.pdf?index=true
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_04c3ce4d1c064f3193af94f4ed3ad002.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_f90d10a60ce34bd287351da76efa5fb0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b26d146-1806-4ba0-b065-0dcabb6d130f/linear_algebra_a_modern_introduction_3rd_edition_solutions_manual.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_f1ad9232a97a47d8b3f4db2cf25691c0.pdf?index=true
    • http://minirulo.epizy.com/pcsx2_windows_10_32_bit.pdf
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_7a65130378644bf59d175c88759a8bf3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0da59a82-f340-4085-9885-5985db9b0a22/do_xbox_360_turtle_beaches_work_on_xbox_one.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_off0000ec05.bin
cdc56ea6f8d83b144f04e998569093b3ab91b7b35862b3d760b7d9d46ed45303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 5028 bytes
font_01_sfnt_off0000fd2f.bin
cd4418d4753b4e816cab06e6cb826a51eca91e509c44332d9993bfd453232732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10816 bytes

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