Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6f7fc517098d15…

MALICIOUS

PDF

82.1 KB Created: 2021-03-28 11:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8630f5e9c7f24260eb8184b7a13d4a9c SHA-1: d313a4e69cd9f4e7d80105a64926e1e05afadec2 SHA-256: 7f6f7fc517098d1545e0241ff1dac8fd8e72da7907338be49bc2a1da8e75232c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. The primary URL, 'https://dafemum.ru/award?keyword=blue+bloods+cookbook+pdf', suggests a deceptive lure. While no scripts were directly extracted, the PDF structure and the ML classifier's high confidence indicate malicious intent, likely for SEO spam or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/award?keyword=blue+bloods+cookbook+pdf
    • http://nubigawe.22web.org/xapiru.pdf
    • http://boldly-grow.com/how_to_learn_stock_market_tradingqkwy1.pdf
    • http://sadovik.me/vepitea44y0.pdf
    • http://natorg.fun/fema_training_ics-_100._b_answerssedsw.pdf
    • http://dress-russia.ru/3d_face_tracking_librarye90ra.pdf
    • http://erogan-columbia.site/vojafajepobeki7n3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://simolerifape.epizy.com/heroes_of_olympus_book_5_online_free.pdf
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_7b365aba390b40f6a5cf24ce799dfa99.pdf?index=true
    • http://melaworogafema.epizy.com/binomial_normal_and_poisson_distribution.pdf
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_01ce5c8b31e347aabf81cba0a67565d9.pdf?index=true
    • http://tobesonev.rf.gd/24342586086.pdf
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_f005e001b2fb4813a4be39932758acb8.pdf?index=true
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_fbee1bca3f524040adb84d5e0bda6205.pdf?index=true
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_a773b1d5532342e6978259aec7dbf3e8.pdf?index=true
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_62b0aaf7411b42b78f4f19733b2d17ae.pdf?index=true
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_65ac11d1dea743d18db2c689a1e817d8.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_8172d002642d439a85989289daac1434.pdf?index=true
    • http://fepoxojosatomu.epizy.com/87001441308.pdf
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_661e766b832f4dd7be4b2c9891225d08.pdf?index=true
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_a388ebeb6c8541de9a6af8e9e8ded7cd.pdf?index=true
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_c386798f174f46219d67e4837eb9d656.pdf?index=true
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_688c3537248945d097403e15cd7bb934.pdf?index=true
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_ed2189f12814486586f1176849417635.pdf?index=true
    • 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_off000103ff.bin
656d6bd80916cb8b3e9ab305774b5553dd3570f401a671e926f186bd9fd9ea65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 5096 bytes
font_01_sfnt_off0001156f.bin
1afa19b6ddfe307c2fdd9e88a28b34c898dcc6e29df6f310143d33ae7b574a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 11372 bytes

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