Malicious PDF — malware analysis report

Static analysis result for SHA-256 9173cb7cdb6e2461…

MALICIOUS

PDF

95.0 KB Created: 2021-04-30 01:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da9c14f427171ce20d793df1492e49f0 SHA-1: 7fe4dfd184f1cc399df10e4290b749b8f2518e75 SHA-256: 9173cb7cdb6e24619760ddc573bc6d50f8db60663d8e81a4dd2e3b0040fec18a
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one suspicious URL pointing to 'dugedepap.ru'. The PDF structure and the presence of numerous links suggest an attempt to manipulate search engine results or direct users to phishing sites. No scripts were extracted, but the PDF's nature implies it's part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9584

Heuristics 4

  • 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
  • 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://dugedepap.ru/strik?utm_term=how+to+use+table+d+in+statistics
    • https://cdn-cms.f-static.net/uploads/4449783/normal_60292edaee565.pdf
    • https://cdn-cms.f-static.net/uploads/4413455/normal_604cfc5007274.pdf
    • https://cdn-cms.f-static.net/uploads/4415944/normal_602a36e220d1b.pdf
    • http://tolenamesakeraw.22web.org/descriptive_statistics_for_data_analysis.pdf
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fd734537dd32.pdf
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5ff54dbd592a3.pdf
    • https://cdn-cms.f-static.net/uploads/4458137/normal_605f95eadeedc.pdf
    • https://cdn-cms.f-static.net/uploads/4409997/normal_600b3e3207ec8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_032b843b29ab405c8a87527f857b5ff7.pdf?index=true
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_a5b2cc75794f45308606fa779c645165.pdf?index=true
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_cd819ea3329740aca543b7721c91ef02.pdf?index=true
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_1326829bde1045d4a56659a1ef6ba310.pdf?index=true
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_4a167f5192354527b821b6a5a189039d.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_7d2b8c0c4c31459181019540039a1121.pdf?index=true
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_ffd5645ae92c4ba68edebf5caced3f15.pdf?index=true
    • http://godavuvexo.epizy.com/templates_in_mailchimp.pdf
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_e89c554e6f164299918fef6c1270579d.pdf?index=true
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_a88713f95b034a17b74d672e1b667697.pdf?index=true
    • http://tomosuromiv.epizy.com/american_english_file_4_workbook_free_download.pdf
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_f478c6390e18437bb438bc732e0428da.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f17.bin
587745a4de17818697e19983becf9b20b7a4cd27bafa25df8aa49d6d4a7c8a41
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F17 5028 bytes