Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f04c033fffd9c04…

MALICIOUS

PDF

81.1 KB Created: 2021-03-31 03:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 184c6d30376629aaee6d76b848d4ba69 SHA-1: b4c42de7a38ad9fa8ec12ccbc3513f47f14635fa SHA-256: 7f04c033fffd9c04e0f0a891a080f8941789bf297548e564dc7a7b4e0a2c2a7a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm detected by heuristics, suggesting a phishing or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jumiwimov.ru/123?utm_term=bowers+wilkins+formation
    • https://cdn.sqhk.co/wodabakope/k8ifYIc/nixelajunuzunebe.pdf
    • http://bagutoruramig.mywebcommunity.org/28584304904.pdf
    • http://kekijojovif.sportsontheweb.net/74975459041.pdf
    • http://modezewop.mygamesonline.org/kopedonawizidima.pdf
    • http://matimomewojime.mypressonline.com/film_camera_shots.pdf
    • http://xanevejesofag.mygamesonline.org/la_chute_albert_camus_gratuit.pdf
    • https://cdn.sqhk.co/xizefonuma/g5N326T/livokurefijegofavam.pdf
    • https://cdn.sqhk.co/lunabati/heeiGjd/lantern_open_internet_for_all_download.pdf
    • http://pivojowemetobiv.mywebcommunity.org/46554245053.pdf
    • http://xawamiwupajev.mygamesonline.org/45455027889.pdf
    • https://cdn.sqhk.co/jalotenabo/ijjhhi8/yeet_meme_pictures.pdf
    • https://cdn.sqhk.co/dexizajifu/gegjK67/biwezumadow.pdf
    • http://giwitap.getenjoyment.net/10233336811.pdf
    • http://linavaluviriv.getenjoyment.net/74256002007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_f3a42aeae132461b85f2a9bfd9d74ba2.pdf?index=true
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_3b4df138415641888d46226efbe9338b.pdf?index=true
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_475aed5ea34c4a7daa87d3c97c02c0a2.pdf?index=true
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_7fef4d3a80db4500be54229573202c61.pdf?index=true
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_a0603f8c6b294cb7b54324adb424b717.pdf?index=true
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_2f3736ecb1514d5e939e35d9f70ee728.pdf?index=true
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_0cce4c7e487d4290a79fd7b47343c0d1.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_3854a775528f4ce3ae07a317ddcaed71.pdf?index=true
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_c0c52554ad334eaa8b3b42f916f47f89.pdf?index=true
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_810254e4dbdf483eb774ce25a50dd36e.pdf?index=true
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_4cc1a73676364f23aae909cc530296ec.pdf?index=true
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_5a1f58a6d6254f0bb324be012d80e3f0.pdf?index=true
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_d0ac22f95aea4d828841993094624c4d.pdf?index=true
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_1d3f5db08fab49d2add02f6f3679aaf3.pdf?index=true
    • 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_off0000fda3.bin
8e07bc21358a4c91be131cf02201f2b4c4654a256fbf04386785b3ba02cbca2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 5120 bytes
font_01_sfnt_off00010f08.bin
7946a66febd6e17be3472e6c92738a780604517cbaa0e5369680b94133b1bb8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 11692 bytes

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