Malicious PDF — malware analysis report

Static analysis result for SHA-256 d231f3f82649f361…

MALICIOUS

PDF

84.5 KB Created: 2020-11-24 03:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b31a10ec5ffee9c2661e6712915945ed SHA-1: 91f40e89bc7e3a5c79a6f6d52a963538a6758800 SHA-256: d231f3f82649f361edbf3f985f85dc16c90eec28302e36a9ae62d66d11bc9508
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/aws?utm_term=periodic+table+categories+organization+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420434/normal_5f9ee71635362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5f8dab0604b9d.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/2787789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5f9ed3be911c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_5fad4c3a315f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5fb4c2c02f961.pdfIn PDF document text
    • https://nufulukoveta.weebly.com/uploads/1/3/4/7/134700555/zerisosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5faee3f2035f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5f904a25f2c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5fa74b245b28b.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/e44d3f25-afd7-426a-928e-2503747ee765/temple_run_1_game_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9514828-c9fd-42cf-98f4-09d54e7769a6/vetev.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_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 5336 bytes
SHA-256: 28f71335497288becbe628db1020a6850944e76bd1f68215bb04b4388d6c60aa
font_01_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 11016 bytes
SHA-256: 9da7247003c1c1470eed7915b95e1e00201c81f11bdbe7613311510b6359b9f9
font_02_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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