Malicious PDF — malware analysis report

Static analysis result for SHA-256 b021d3b0c62271a3…

MALICIOUS

PDF

100.3 KB Created: 2021-03-29 17:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33af38e0c8410b0598785863aa290394 SHA-1: 50fccb0866d432e21ce1ea1d78a3998e6a636daf SHA-256: b021d3b0c62271a32ce477e330210d737e6a3b7d8f7a0c5cba2aa143bd75894b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent link pointing to 'https://pelibifir.ru/wix?keyword=unblocked+games+76+car+eats+car'. This suggests the document is part of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious or low-quality websites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/wix?keyword=unblocked+games+76+car+eats+car
    • http://wersita.fun/formula_para_convertir_de_pulgadas_a_mmj59ej.pdf
    • http://melidagerukebel.sportsontheweb.net/forgotten_realms_campaign_setting_box_set.pdf
    • https://kurotasa.weebly.com/uploads/1/3/4/4/134494220/nabotoze_dasugoredusak_zotatagifupe_gabov.pdf
    • http://sixesijilolun.mywebcommunity.org/desixerigoz.pdf
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/kivuranuxatupenita.pdf
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/rafagenumudosed.pdf
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/sojumagube-zutisikemi.pdf
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/1452a847ad50c.pdf
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/1432391.pdf
    • https://tuxakosubulep.weebly.com/uploads/1/3/4/0/134012578/vefixumigolafem.pdf
    • http://biwiroxefamir.mywebcommunity.org/vufif.pdf
    • http://fortysgjdk.fun/can_i_have_two_wivesmhxnx.pdf
    • http://ilook.market/80553124170bno4w.pdf
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/d905491eb.pdf
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/7559724.pdf
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/xipidu-lavodo-beduzefavif-tisifunuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wizuluworafid/druid_of_the_land_spells.pdf
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_e76823eab67a45c699c779cc9d90bf6c.pdf?index=true
    • http://tiluxusimutine.atwebpages.com/pioneer_vsx-1020_remote_not_working.pdf
    • https://s3.amazonaws.com/vufupu/87296687279.pdf
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_2549b645b4ad4cf6a6d5cbad227c5448.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012650.bin
183cd5619a0739ef165ef09295a80f28f2edf6d68de3ebbf6bec2319f9d9899f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 5428 bytes
font_01_sfnt_off000138ac.bin
231f9633ac9770b1a9375e2bd0093cc8b2cfd71669cdfe1ec48d9002e991cb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 11580 bytes
font_02_sfnt_off0001604a.bin
42b86f4c7d12b3db81c2ff8554006990fcf71a6371f35020978ed516e7513ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1604A 16208 bytes
font_03_sfnt_off00017584.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17584 4324 bytes

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