Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aa8170c84e3d90…

MALICIOUS

PDF

87.8 KB Created: 2021-03-19 16:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6c73e301e983040a8e76d08acbe247d SHA-1: ec1c35f0c2130baf49cda828a700250706019699 SHA-256: a1aa8170c84e3d90b0c6066e019a9d94c90b9e068241eed10b254bc5e833a37c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'CLAMAV_DETECTION' heuristics. The embedded URL 'https://botokaw.ru/aws?utm_term=flexible+dieting+meal+timing' suggests a lure related to diet and health, which is likely a deceptive tactic to encourage users to click through. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/aws?utm_term=flexible+dieting+meal+timing
    • https://cdn-cms.f-static.net/uploads/4476925/normal_600ff852e9f10.pdf
    • http://kulofokugizadeb.22web.org/67196511788.pdf
    • http://vukogosapejofa.iblogger.org/which_ti_graphing_calculator_is_the_best.pdf
    • https://cdn-cms.f-static.net/uploads/4412377/normal_604ce0922e272.pdf
    • https://cdn-cms.f-static.net/uploads/4373304/normal_604af72a40f4d.pdf
    • https://cdn-cms.f-static.net/uploads/4405459/normal_600df7056700f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_95f295719bf04363862f6a71fcc8ebb0.pdf?index=true
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_6b6c999ea0644e3da59d83c4fc835b60.pdf?index=true
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_7ca5b01e434446a3ae68d2c57b960d9a.pdf?index=true
    • http://lapabogi.rf.gd/3595182838.pdf
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_27818a80be57486da77f133c5a773592.pdf?index=true
    • https://20097937-9b7a-4da4-851c-33e9a8906939.filesusr.com/ugd/1e3518_4a76d36e6bc947f88edef5c8a863605a.pdf?index=true
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_52de9f44399f4c69a5437cbd77276764.pdf?index=true
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_7eab4f0199c446d1b7445155e709a277.pdf?index=true
    • http://wulumowitusok.epizy.com/xomamuwu.pdf
    • http://wumupufavagavoz.epizy.com/7137105574.pdf
    • http://vodomuvukowoz.epizy.com/top_builder_html_template.pdf
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_f10406ee9ddf4f80b1df3def65d01f9c.pdf?index=true
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_10978cc7796142169e179984e79849f4.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_38e651c28d474de9afec9795487440ec.pdf?index=true
    • http://zowonotetejubi.rf.gd/baseball_score_sheet.pdf
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_c72832b6810944c89ed00487179cb0d8.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_44a9f25e989e4981935306cbac03eb9b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ed.bin
9006f242c6629b294bce441e705f54edff4b0ba7afcd39be2b8bc72de82271fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 5032 bytes
font_01_sfnt_off000115fc.bin
4efbc6f4bbd7f1854dd06c9b40e3f14ec2415f25896c7aa4c50ee9e189a164e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 11176 bytes
font_02_sfnt_off00013bff.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 16204 bytes

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