Malicious PDF — malware analysis report

Static analysis result for SHA-256 6957728bb0c693ed…

MALICIOUS

PDF

83.0 KB Created: 2021-03-23 11:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0192a1aba4c8503197359c6001afc4b5 SHA-1: 81700965cd8d85379a352807ce974452d5d0b52b SHA-256: 6957728bb0c693ed39b96bbda0366a972cef2f645637e94e3bbadda75e0e3f87
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://jacksth.ru/wix?keyword=gta+san+andreas+data%252Bapk+highly+compressed', indicates a lure for game-related downloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=gta+san+andreas+data%252Bapk+highly+compressed
    • https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/dajiju-tixiwefeke-xodusumevi.pdf
    • http://testertumentum.space/codes_to_program_directv_remote_to_sanyo_tv4up08.pdf
    • https://cdn-cms.f-static.net/uploads/4423442/normal_60561105b19bc.pdf
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5fe2342f8e38a.pdf
    • https://cdn-cms.f-static.net/uploads/4464735/normal_600d45ef51503.pdf
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/493427.pdf
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/d3112.pdf
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/timadukireguxub_jojamikik_xarivofapun_nopadafusem.pdf
    • http://bcipreactivaperu.com/robert_collier_booksrs6gz.pdf
    • http://avtoshtorki.shop/67398900185xlu9f.pdf
    • http://trydouche.xyz/how_to_get_acceleration_from_velocity_time_graphlrgy8.pdf
    • https://cdn-cms.f-static.net/uploads/4503033/normal_6029d7f78048c.pdf
    • http://govnososal.xyz/zogexikozadixekfr9i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_cbe73911a42c43adac30a9c3738dabdf.pdf?index=true
    • https://s3.amazonaws.com/kiremefegonar/yankee_doodle_trumpet_sheet.pdf
    • https://s3.amazonaws.com/liwara/billy_elliot_movie_soundtrack_free.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_f9577120a5c34ab8a99b6830bdee7ef7.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d2dd4e31d173412993ca40756c81d812.pdf?index=true
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_99e0431991ce4cd2bda200dd7a22ca73.pdf?index=true
    • https://s3.amazonaws.com/vizegemawokaxe/gizosesusudozunigagili.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef6.bin
0240f0af69da10497d857698e77eae4aac0d7deac549f4ec73e9fe4f6186b6b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 5684 bytes
font_01_sfnt_off0001023c.bin
2a659ec64516052e9f8c3f1579cac5cf442bf52156eb0b08f5cd13320dd6ec36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 11136 bytes
font_02_sfnt_off0001281c.bin
682a406efcdf7dd49f9c494c129bca6394f160b3e372cc4ba493723cd6bcd7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 16660 bytes

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