Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7961f661a5ce02f…

MALICIOUS

PDF

83.5 KB Created: 2020-12-25 00:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d9cb753ef2c32dae7a73c642c8c3b223 SHA-1: bc3900fdd7d475f1aa21e924987bd74b5ad3414c SHA-256: b7961f661a5ce02ff28ccdb28656c1509f84793b66c19383cab15a3c50df6372
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=what+is+insubordination+at+work PDF link annotation
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/8438991.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/zivipiwilefizoj.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/b0f33569e872f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_5fc2630c5b5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f9d692f3796f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_5fba5be7bb0b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5fb553f648a48.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/idEgiNs/25209748893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fa0ba81ab09c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_5f9758622312b.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/hahaGhd/parkside_australia_current_time.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://s3.amazonaws.com/daxemo/susoxenu.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/gekukem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cfc6a8-04e7-4df5-b5e6-b01026f5e061/98165216528.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 4956 bytes
SHA-256: 3d4588d5616f4fe30638ca76ecb5ff521ca758e78898eb7d1d1f3be152f3d6fe
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 10272 bytes
SHA-256: 7f2c1649f8ebb9b615e115e5682b1fd4e7abe359a60727b3d473aa7713f20183
font_02_sfnt_off000132b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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