Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa30a2ac216e71b6…

MALICIOUS

PDF

83.5 KB Created: 2021-04-04 11:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b41e0961e01aa233bf2e97c9ec711f SHA-1: b1b46dd1366d754ef6d13e5e32b9b465b316aee6 SHA-256: aa30a2ac216e71b669c24ef4df869b5484beb045a1e76d0fa0eda83fb15636d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=what+is+the+plot+of+a%2526p
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/nowitivedupukiwus.pdf
    • https://gemudafaleg.weebly.com/uploads/1/3/1/8/131856492/26076e42.pdf
    • http://pametuf.22web.org/zerob.pdf
    • https://rikizanasurixa.weebly.com/uploads/1/3/1/3/131379420/gevalamutilajo-pegazevuvavim.pdf
    • https://daxeluneb.weebly.com/uploads/1/3/4/3/134324592/8885962.pdf
    • http://livobagoxepat.iblogger.org/waterfall_model_and_spiral_model.pdf
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/94851.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bamefifib.epizy.com/bachianinha_2_partitura.pdf
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_843062995cf941af8a06f8fa8e540d34.pdf?index=true
    • https://s3.amazonaws.com/tikofaketonub/70288956785.pdf
    • https://s3.amazonaws.com/fipijife/55204184533.pdf
    • https://uploads.strikinglycdn.com/files/e9c42267-e1f6-4e55-b9e7-0a13ebcc2ad8/91636945157.pdf
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_0df94bd61dce4d9698f2979e3513ad69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b4c24617-5b0a-4b02-8a47-aea1abab8902/fundamentals_of_drawing_book.pdf
    • https://uploads.strikinglycdn.com/files/cb44fcb0-1d08-4533-a802-7209758c04d3/sirobodo.pdf
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_83b064e303ef430a937bc509f70dca35.pdf?index=true
    • http://fegubitexore.rf.gd/fuxatebuzodozikimatuwaxi.pdf
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_346f4b2c5af54dab8e3c7abc53e723da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc51d291-a7c2-4d55-8e43-190dc3bd312f/organisation_chart_of_textile_industry.pdf
    • https://uploads.strikinglycdn.com/files/1b98258a-87b2-45ec-b74f-a5708b59ddbd/chilton_auto_repair_manual_canada.pdf
    • https://uploads.strikinglycdn.com/files/93299cf8-3883-424a-a2ee-648dbc3e5dc3/yaar_nuri_ztrk.pdf
    • https://uploads.strikinglycdn.com/files/7d6d5d82-0ff0-44fa-a59c-41a4a22d0d6f/lujikabelizapirageki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faef.bin
10f527d006a8e871dc00d9c50c7736106bce9fc036440d37cafd565b4206986b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 4588 bytes
font_01_sfnt_off00010a9e.bin
2823bb0861fd6217975dfa4f8bbf84741fdcb1747b36d4ee51a80fb1cc8e2a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 11908 bytes
font_02_sfnt_off0001324b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 4324 bytes

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