Malicious PDF — malware analysis report

Static analysis result for SHA-256 771186e5054cdac2…

MALICIOUS

PDF

125.2 KB Created: 2021-04-05 09:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a2a489f90a195206657dfa7028a62794 SHA-1: 9de5db74ed2f6d2870a275dd71119fbab21c7d94 SHA-256: 771186e5054cdac2d81af07adbb8ea19687fe86b97f9dad53aae4d7716e182eb
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with the primary suspicious URL being https://soxebez.ru/award?keyword=ankle+dorsiflexion+exercises+pdf. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the structure and link farm indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/award?keyword=ankle+dorsiflexion+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/wezufunin/Ml3jbpi/20697175147.pdfIn PDF document text
    • https://cdn.sqhk.co/firataxoworo/ibgcxjh/visigiwaxilesazakufilofu.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/L7zPehj/old_national_bank_mortgage_rates.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/dhhajhV/hearts_of_palm_recipes_appetizers.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/vgejQdD/jofirikafevalimuzagise.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/gdjrhhp/disaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/tugok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13de30d9-59fc-4fa3-a3b9-35e1d05d3e75/what_is_islamic_inheritance_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551a4c3f-da60-4ef8-aa4c-6f84cbe34a93/how_to_get_best_buy_birthday_coupon.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/gopifizupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/170671ac-ce6a-4eaf-8edc-133796868776/kotuxijamut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77daaba7-5c9e-42e9-b39e-fd62f0de5b6f/what_is_philosophy_of_social_science.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_b710a58874b043f0b55b92191e7a4e2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b180dd1f-cddf-4eac-8050-b92f8c14fdcb/versalift_bucket_truck_hydraulic_fluid.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/noxalezujuzo.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_6fb4da333c85443ab5753b889ee557e3.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_9fee4f18f66a4ed1943d4713a32135a3.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_off0001adb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADB4 5060 bytes
SHA-256: a2cb18175d1de34390a670c7c4d7aefac912e1f498666b7f71eaa0e3bcff9e5f
font_01_sfnt_off0001bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF06 11964 bytes
SHA-256: b8e3f59dd2c224ae34e5e14a826ce490a8c2e008a3352db3a139697fc6307a9d

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