Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb334890987b722c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-10 05:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc0302c509f55bc0021810db2468d94 SHA-1: dc1ec3f1d55bf4efe360c4ce8c6ba847379beb33 SHA-256: bb334890987b722c7e8512648570dcdc20205c2cc810e2e5c446f5ba3fbf7a52
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of a malicious URL and ClamAV detection strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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
  • 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/123?utm_term=guide+du+candidat+cnrs+concours+interne
    • https://static.s123-cdn-static.com/uploads/4376857/normal_5ff90a4beed25.pdf
    • http://mishabelle.ru/837154151945h4q6.pdf
    • http://slampochka.ru/7._1_our_planet_of_lifecyy3l.pdf
    • https://cdn-cms.f-static.net/uploads/4412575/normal_602141cbf33a8.pdf
    • http://parkingtest.xyz/proform_hybrid_trainer_xt_elliptical__bike_review1o3po.pdf
    • http://weareanonymous.org/game_maker_8_3d_examples_downloadlt6mp.pdf
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fcefda14ffed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_87c866c44c224c5b8c6c1ec0282f7ec2.pdf?index=true
    • https://s3.amazonaws.com/genukopapovixo/dig_7001_irrigation_timer_manual.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_236a4fecc4b54da3b66b0be5f5d665fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a8e830ce-bc93-44d4-81f3-7991848b7a45/is_black_and_decker_a_good_brand_for_appliances.pdf
    • https://s3.amazonaws.com/mokamoba/energia_eolica_funcionamiento.pdf
    • https://s3.amazonaws.com/rexogeguxosix/70009738549.pdf
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_7edc266228694002943d96ec85c7aa81.pdf?index=true
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_5a7c4e7ce9214113b8a3401e8488fb40.pdf?index=true
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_08df3e38521a4c1c826c4af1aa9594cf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/911130d7-a60b-4507-a5ea-21240048e2a4/ncert_solutions_class_9_physics_chapter_11.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_7d3d28d9f8294df19b98aeb5e0f311d7.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_56c5edbb9f3a457c835969d4806f29ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a8e5a5ac-169a-4340-aae0-fe9225d74245/81881252618.pdf
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_e8e07ae9d6e947168a4be562e293da1c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23f85426-984b-4b83-9f37-c0f9b69b4f44/voguturagugodatagene.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc08.bin
2e544268f263acd9ca6351c6c2c0ff31cd52496ae5e927ef547ad127d9e01a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 4932 bytes
font_01_sfnt_off00010cd8.bin
1c92b58ebaadd3d374d91ae22f58974607c2a1652dea5542847012ace76f6db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 10544 bytes

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