Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9ae2285c718c45…

MALICIOUS

PDF

98.6 KB Created: 2021-03-18 13:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b42a22bca6f0e5e1772e0240da5136b6 SHA-1: d6c7e62d2887a9b4e8144f6e6711190d341c5ba5 SHA-256: 3d9ae2285c718c451c4d9028ac16fdf57b7de2b7d1e6553967b11a621aac57b2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDFs hosted on various domains, some of which are disposable. The primary URL, 'https://jacksth.ru/wix?keyword=triangle+constructions+worksheet', suggests a potential SEO manipulation or phishing lure. The presence of many external links and the detection as a phishing trojan points towards an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=triangle+constructions+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464056/normal_6048c2fd1e337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_60240df3bf1d2.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/46738367378.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/zokesodoliz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_60290de4b8bcd.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/58193703172.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_1d045758a97a45e4bb05ec427143b147.pdf?index=trueIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_505cf10ebb20451b8bf32ee726f17e60.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_9d53219cd2cc4f5a85103edb46b62b05.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_b06057c7b74a4f549fceea35a2a05ada.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_4e02f37a67ef4df7ac9cac95f9b1d639.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_f3f1045ebe8544228d848374018a6835.pdf?index=trueIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_7bf47961443d42b5aadb3a8fa8bf3201.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_114bbb77901f45e594a254d97dc5d477.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_22cf9dae4427423c91579bea2785dda0.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_49fb79e5fb7b4fd09cb1999905d26e46.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_104e7c8e674f4b7d992159dd290b8b3c.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_659e305b178242a5a09deb21fedd5eb0.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_5e472e551d8c43b1a4dbf14e35434ff5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 5048 bytes
SHA-256: 3407a1bf7acf5bcac63b63e689cc0da4cf3561bf804e59c6c2c2d92e5fcfa1f3
font_01_sfnt_off000145c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C9 11572 bytes
SHA-256: c490268fd9890c1f5fed83fef9b69701c37afbf619e03c89626aa5b4c4b2a0d0
font_02_sfnt_off00016d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D07 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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