Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b486efb28319cc9…

MALICIOUS

PDF

63.6 KB Created: 2020-12-05 18:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: aa20c52bebd5263843b6593a6eb73e77 SHA-1: 935ccd38e2fe3d6ea27c9dd14142c3383490239d SHA-256: 0b486efb28319cc963cffefde37fa653fff789ef8e2852989ec08572fe0145a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://traffset.ru/123?utm_term=treasure+seas+inc+walkthrough, is a primary indicator of malicious intent, likely leading to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=treasure+seas+inc+walkthrough PDF link annotation
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/xobuzotifi_dopituz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5fadf22461287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_5fb4e0b55c379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450506/normal_5fb81674d4c38.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/tatej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_5f8abbc288dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5fa662b7d3e9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42a11fa-74e3-4798-aab3-8deb96086d7d/maximum_ride_max.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0ea682-19c4-42c7-8640-0a0e762344c8/tri_merge_credit_report.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2b38cb3e0f57711879d2/1606298427770/birejenopubelenupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bcde88-0df4-4a34-8ee4-ed3e02b72463/defender_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8c5cd9-978b-4d26-b0bc-c9b736bb46ca/william_branham_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1db6634219316b32adb2/1606229430980/lifuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3dba37-68e3-499a-a20b-164b9772e76b/94572439891.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 5164 bytes
SHA-256: 86aa03f3ab908e18639e2a979289ff9e8c84f7806affd14a06cf3f2376164e13
font_01_sfnt_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 10644 bytes
SHA-256: b2c9a01a39a70644180596798ffce182d95737182431a4867c6035ba9a4e8461

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