Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82aacfee4bf03f7…

MALICIOUS

PDF

103.1 KB Created: 2021-03-30 18:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3030f515233a9b6c696bd28c1af57fa6 SHA-1: 9e005ea9fa8dac1f39cbea86f2909890811a898c SHA-256: d82aacfee4bf03f76beedfcdd20aff626aff94a76b3f27c66ded3eea8b5bde29
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=prentice+hall+biology+miller+levine PDF link annotation
    • https://cdn.sqhk.co/devisofage/NUghgjM/chef_ludo_lefebvre_net_worth.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/gojakakikuguka.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/XiatRRx/stickman_warriors_2_epic.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/balil.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/hjjfhdg/39859459850.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/dAIkqTn/55207996454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_1bb638eb68144475b98de587d44211b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/44637077471.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_0427e227c16b497099cab37394822024.pdf?index=trueIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_736956b580c74a2c84e319ac9ff77765.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/how_to_open_digital_sentry_safe_with_code.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_070e6b7f476e4cae89d1a7a0384ecd11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/junaweriximigogiwofeposad.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_5a56f93cb100435690436f5ac1cfe68a.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d2293116abbc441f8455cbf1ba2f4cf7.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_08b977af73d145ac80e074646cb5a912.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_8e76f62f1e6e48998e10641249e83082.pdf?index=trueIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_b05b3cbd224b41769db600efa423f317.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_1aab7f3949af43baa1ec35f101ae04fa.pdf?index=trueIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_0c72b40bb5224c12ba5c6f40ad0a8db4.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_0ddee7daef2048d49e818a3d6bb09624.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C9 5340 bytes
SHA-256: 8356455e84b21f78ca0b506389221d53ad022dd3ade62c6d4c88166de195230b
font_01_sfnt_off000163d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D9 12764 bytes
SHA-256: 84c8cb2c7428ddf524e9970554bb99e635eefaba75cbf6e663b8f3e3ffbca767

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