Malicious PDF — malware analysis report

Static analysis result for SHA-256 884026c65ee33355…

MALICIOUS

PDF

61.7 KB Created: 2020-12-27 03:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c51a66575b894ba8ca2211b40ea64bb0 SHA-1: 1161a86d6f85b2196354d2f61e522b0d6bc1fd0b SHA-256: 884026c65ee33355edd7b5b20a7f76d7954dc8c6dafb0d4047bed8057358a33e
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 0.9996

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://trafffi.ru/aws?utm_term=internal+investigation+report+template PDF link annotation
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/semujibapi-zixug-duxux-laxasufojikaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417543/normal_5fdf4d639b9ae.pdfIn PDF document text
    • https://nejufolij.weebly.com/uploads/1/3/4/8/134883139/kumide.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/e6aee255-6eed-4319-a8eb-2cdb15b1a50e/sam4s_cash_register_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b18998e-889b-4e09-8f40-12e7d44a4d95/34294944974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbec8940-fc16-4fcf-82f3-f1e8d6ce5608/xafojofibatidofewumone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4680ee4a-b37e-4b44-87f7-12f922a9eb36/cec_conference_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d48423f-443c-45c1-acac-1dce81b50e5b/37649993847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904a5a0d-b357-481c-8f53-14630dadcca4/strong_medieval_names_boys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5003f48b-2255-4d45-a61a-acfe31ec42bd/nafukikodajivaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9609502-2b64-4f49-ba4f-f190ac855efd/vocab_level_h_unit_10_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509e8cab-f796-4283-934b-ffcde6da97d7/58165945623.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_off0000ba6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 5136 bytes
SHA-256: d29891471c37ccfad964af7b545345d37bb2379ed87954e0f0be4f0491e8b273
font_01_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 8788 bytes
SHA-256: 4e143c71af1a6c285d88a9ea5cfb55531f8c947998ef51dcab7d7ecba01975fc

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