Malicious PDF — malware analysis report

Static analysis result for SHA-256 6462924a51cb9e86…

MALICIOUS

PDF

73.1 KB Created: 2020-12-26 00:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 43481f3c577a59805df78ee5237f4785 SHA-1: 94b4772b5667a101b68c7d8eb186554ecc52c929 SHA-256: 6462924a51cb9e86f5a7150dc8f17e2c1aa6e09de6185b8d6adb5c78003e296e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF files, indicating a link farm designed to drive traffic. One of the primary external links points to a suspicious domain that appears to be part of this scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/strik?utm_term=angry+birds+2+movie+trailer+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5fd991abbe9c0.pdfIn PDF document text
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/ad1fd846.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/4df46ae8-8a10-4eb5-914a-31efdcfb44ee/long_ringing_in_right_ear_spiritual_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6d7fe6-c7e2-41e4-bad1-dad02cd522e9/82820642355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091468f4-554c-44f5-9c8b-bf4708cb234d/99003826913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf38cff1-0adf-4f70-9e2c-4bbf4c68191e/16771460822.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/inferential_and_descriptive_statistics_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfa185a-846e-4d19-90a4-ed882d36bcc7/fisotilokola.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/grim_dawn_purifier_build_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80a6a1f-21b0-491c-8148-c66efe599ae8/likora.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/vinilepe.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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 5568 bytes
SHA-256: bd40520d71a59586e4c3b09ab726514858c86b8198b58508bbbb0ed663ef0d9a
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 11132 bytes
SHA-256: b6de08e05471e010336f8fea6b1857b0277f4f4c4fa0a088830a07ee359b6e5c

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