Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7baa5ba68b7dbc…

MALICIOUS

PDF

73.8 KB Created: 2021-03-30 20:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d38f451f71e6abe606991ffbc130021 SHA-1: 944b4b4efe401ad8032a1dfad501636503e1a0d9 SHA-256: ba7baa5ba68b7dbc6146019363818651ff838fbc73461274b3579de1fbcfe312
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, characteristic of a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this malicious intent. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=solar+system+model+project+6th+grade
    • http://fuvisetitisenon.mypressonline.com/bland_diet_spanish.pdf
    • http://tetutunugu.iblogger.org/fukasutimemoramo.pdf
    • http://birjand.design/867225879350887a.pdf
    • http://keysecret.ru/jupitaxuvamolixejuborugeku9ie.pdf
    • http://nanebaxexob.getenjoyment.net/graphic_designer_jobs_nyc.pdf
    • http://jawogili.22web.org/kitajobanu.pdf
    • http://prequester.online/849596018m0plv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_765526696cf846c5b45d06861d1a2b56.pdf?index=true
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_782280d295af4d71bb44d8a3e9a1973c.pdf?index=true
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_107d173c0247449c8112d0e44cee87b4.pdf?index=true
    • http://tupemovon.rf.gd/bekaboo_altbalaji_full_episode.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_d13612f9e7de419192d8210900220850.pdf?index=true
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_0113c158f5874be48305635f1960fbe3.pdf?index=true
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_e525265bc85444caa7ee13734d367b78.pdf?index=true
    • http://vutafinaragod.rf.gd/rodizubidebomudez.pdf
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_e0ff80340aed4c3bab1209aa3378d48b.pdf?index=true
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_c83e4ee1cf3d42bb881d52a60c02ef0f.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_off0000e232.bin
81e2442f3579d266d907e52e3a9c68f00266c308419e7ba076ef4d4c6b5e3cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 5920 bytes
font_01_sfnt_off0000f639.bin
a2a7ba7b3fc77337d2a37b06f6011b9ed65f1d8a93345b1080a3304101d4b773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 10992 bytes

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