Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f1e88810596d0f…

MALICIOUS

PDF

80.0 KB Created: 2021-04-04 22:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 083d5d9d3b2da703ee83a8e5fc1c0f52 SHA-1: f1018f8b499fabc8a130015541547e66efbc4596 SHA-256: 73f1e88810596d0fc145ea03891549adba562b3287f8e382763a946fa0bafe6d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. The document body, though heavily obfuscated, contains a question about covalent bonds, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=which+of+the+following+compounds+contain+covalent+bonds PDF link annotation
    • http://gejudoxe.mypressonline.com/84951831294.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/gejegume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_6042bd484bf21.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/aplastic_anemia_treatment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_6049e9e627b1f.pdfIn PDF document text
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/56374ceaea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_605fc0a0f264e.pdfIn PDF document text
    • https://gejosubirimo.weebly.com/uploads/1/3/0/7/130776575/wilarajuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6015bbe9d8525.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/57688468164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_0c64e7aa9de64b9280c61cc87a923435.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_be63d7bd1bac4d9dbf5301c994b8f19c.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_3d75044ddd8e4676b46b16d8f0e59775.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_e5d536fb45f746008a452ae00f14a664.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_94b4f41c767945509e5a558de4aeea90.pdf?index=trueIn PDF document text
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_977c5b71a9c24689bc594d533b8b7659.pdf?index=trueIn PDF document text
    • http://zirutabu.myartsonline.com/suvuraromejovosunuxelebof.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_9f7a394b586542b493c49b480f1cc3db.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_6cb5c757cd6a450fa5dc9ca6d535db73.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_0c3add4f3d07484aba6d273d957a093d.pdf?index=trueIn PDF document text
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_4a4f15d3531541faa03af243b68f6938.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_b2c66747cf204603aad1f626332d9d09.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_3e29d2248db04038b399ae7c423f32c2.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_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 5776 bytes
SHA-256: 48d806980f2179f5db7d26f0581b09adaa6a289b0cba14aee528d3407ca51a07
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 10780 bytes
SHA-256: 1151df5f7cd7ef814d2c182b436d0f5e24d49f463f7c6f6ea16b848e68278ece

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