Malicious PDF — malware analysis report

Static analysis result for SHA-256 2108e44dc4c15349…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 13:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ba9f7fa304a9647e0218974154f6a7b SHA-1: 6c8d06749000834289d0341ad7da8ddc32324dad SHA-256: 2108e44dc4c15349bcb203027ec7d696a19a3db76eac72fed5784ca582b1acb4
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO poisoning and distributing malicious content. One prominent URL points to a file named 'install_flash_player_ics.apk', suggesting a lure to download an Android malware disguised as a legitimate software update. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=install_flash_player+ics.apk+free+download
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/nupas.pdf
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/fdc2ee2.pdf
    • http://nunanokipikade.22web.org/my_dehumidifier_is_leaking_water.pdf
    • http://faporivifavavep.22web.org/60547811427.pdf
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/rizemosijafamet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kupuzoliku.rf.gd/zezazunotizuzubade.pdf
    • http://sitizef.rf.gd/pentair_pool_pump_curves.pdf
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_7ff00a067be641659be8fce913f2b97e.pdf?index=true
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_a18ff7aec997443a834235b80861cd93.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e71f760-0bc8-47dd-8313-78a5b9a10276/small_dvd_player_walmart.pdf
    • https://s3.amazonaws.com/guwutivupudutu/basibalokez.pdf
    • http://wenadudik.rf.gd/92072635644.pdf
    • http://fenigubigona.epizy.com/36076864338.pdf
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_ab743a3909f2400db828f47768047952.pdf?index=true
    • https://s3.amazonaws.com/pulavokaxe/40125894286.pdf
    • https://uploads.strikinglycdn.com/files/4f1a5d5c-dd30-4d9a-84fd-819c3b12b13d/78690926072.pdf
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_e7a88915cbb74058b6c01dc776b8b061.pdf?index=true
    • http://tumezubix.epizy.com/scrabble_word_dictionary.pdf
    • https://s3.amazonaws.com/jevelel/fifopatovuziwafopan.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_f35e2409fa3c4a43af416bd1e8df3e7c.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_off0000eda9.bin
97c3cda33bab4166eed1fe3c706bbb39310cd0820c2f102d443893c85aecd788		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5500 bytes
font_01_sfnt_off0001007d.bin
66225f2ca7b94e8e06953e8efddb1c6d188ad9fa75fef2e99d874607e498ad82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 10916 bytes

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