Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8f71c1afec17bb…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 11:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ade0eb86338b5772d0c66c0c217725b0 SHA-1: ba6de9f6980ec93eda0d72fdb52e26f88a9e7097 SHA-256: 6a8f71c1afec17bbe5496deacee4aec535300a2b268ecfac097f1d4ab2642af7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a mass of external links, likely to manipulate search results or redirect users to malicious sites. The presence of embedded URLs further supports this, although no specific script was extracted to detail its exact function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=list+of+household+expenses+template+uk PDF link annotation
    • https://cdn.sqhk.co/jogowijalaro/daghgdn/57742081818.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/fjcNrij/fojixorojoreraku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_6031e70d3c3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_603d23d50a50d.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/YGhaibo/fifexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5fdc59e120ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5fd2607981753.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://uploads.strikinglycdn.com/files/a135f14c-2987-4906-b4e5-9a9265849a6e/95286240072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec08a10-2d9c-4829-bf99-233b7332df7b/74834109037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b18188-5c75-4820-aa7c-620094898915/what_is_history_of_christmas.pdfIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_46729b00c25f4aa198d531c78b39285a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42224e11-4e49-421c-8cdf-1c7c8902d242/20513166343.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_e2e29575147242e6b3a29d5bcdaff471.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb75f7a-36d7-48ac-8357-adf1d47ac9bf/samsung_uhd_smart_tv_50_inch_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad79cfd-c17b-40b9-a291-7d4d598e1cf6/wd_my_passport_ultra_1tb_review.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_2e60fc8eb8364358a20a40dc16595d96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/974f908a-2ced-4d39-bc0b-8debc677dcd7/23072185825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135e3d0e-fb4d-450e-8bb0-cb6454c36cf5/lidizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08eeb275-e757-4ae6-a98e-e57239fa055f/21549898542.pdfIn 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_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5140 bytes
SHA-256: 1fa03c4325c32d9810e6c3d78093b5118881147f90b07aee02d86bd8a87861e3
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 11068 bytes
SHA-256: 05ff892c1341b3ba479f3d727ba6c55fc6272b2888e54fe943b19be6abb852e2
font_02_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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