Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36d1de20ed35730…

MALICIOUS

PDF

82.9 KB Created: 2020-12-27 20:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ed2a0490d344b431082a275e7e8d4821 SHA-1: e96e92486f5ebb94f3024cd3a9364fae8be61ff1 SHA-256: f36d1de20ed357302aed8385aa742caf139e627dad8eaeb9248ad487cd36edcb
214 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded links, many of which point to suspicious or unknown domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that these links are intended to redirect users to malicious infrastructure. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=tkam+chapter+25+questions+and+answers In PDF document text
    • https://bunemanedadon.weebly.com/uploads/1/3/4/4/134476229/xixugubo.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/8537329.pdfIn PDF document text
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/bitiwanuwekib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f8a44b90a03e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f8b329361ae0.pdfIn PDF document text
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/xedusogufot.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/a689391b-03a5-4661-857a-67db81ee60b7/wamivasutid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7242b433-b5da-4eff-afef-6da39c1b446d/bunilerutunogebaxoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1755c1ea-dfea-4644-aa28-82de8ed1f3c6/76201114041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830ff53d-ab4b-4f02-a39a-6fa04dee4bb2/area_of_a_triangle_free_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efac040-39c3-4e2c-848b-47de8889e603/azur_lane_pvp_ship_tier_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/phaser_3_sprite_sheet_json.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597f3aaa-3e12-40b3-bce3-3f76f1a4926a/88108500038.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_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 5768 bytes
SHA-256: b409237ce433862556c243e79326e1c0a39c65574c796e56386833ae6c72ce0a
font_01_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 10160 bytes
SHA-256: c0f4a3a8f520ae0f85461504c6d440b785a544333f9244e345ea6db2d98086cc

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