Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8077763e7bc7c1…

MALICIOUS

PDF

76.0 KB Created: 2020-11-19 23:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 38a669e69d513c602181254116db42b8 SHA-1: 1216e98aad29ba977767e36e03eca4048af27aa8 SHA-256: fb8077763e7bc7c10e250a6661024b0014aa344b2bf77d578c164df241f092a6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=report+leifnarr%2527s+death+to+his+family+xbox PDF link annotation
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/pipowazum.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/4675083.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1c0b3ded-a7e6-4b59-80ca-926f26f13fc2/losafaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b989efae-93a0-4dec-909e-21a9a7ab6e63/fepaduba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0be9d31-593f-4d7e-962a-5d1965952249/jagukipadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97c855e-209c-406b-83b3-c95235b1473a/34872480487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0e0760-fe74-423d-915a-c34266a91d2a/act_2_study_guide_answers_for_the_crucible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60604e1d-9c4d-45f0-8a47-cbe57a62a093/mujusipodetasus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9408f969-da53-40fd-b359-2270395e6101/abina_and_the_important_men_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff62678-7e38-49b3-b7dd-286a04d18f7c/pezexasum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a537c0-1e92-4e5d-9c80-fd494d2cd7c9/9305952373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c626ad-f4ed-4b93-91ac-f420f9d58595/android_app_emulator_for_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926871aa-086a-49c0-98d1-bbd1c17fbeb4/nibojesiledi.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/633486189.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 5420 bytes
SHA-256: 2df1441e9baf53413b18ebe0268bc31ada216273d63aacf82efac337e7d996c7
font_01_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 10948 bytes
SHA-256: fb8a2e9e5cf7086b7e01884440ab8fe9b979f59151f32309d4c7b05816a7cea6
font_02_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16544 bytes
SHA-256: 8d45f5f417e74c11d54eaee7138901bb4b2498e40dea16ccf89f2c2707c13e35
font_03_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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