Malicious PDF — malware analysis report

Static analysis result for SHA-256 c173bd8fe912c575…

MALICIOUS

PDF

77.2 KB Created: 2021-02-11 22:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3d4b78cf1ad5bf3dd7c07dac566ce800 SHA-1: 7b40d4e2ea7b50b3b0e9b57adf8b6084bacea02a SHA-256: c173bd8fe912c5758a4413b9cad1f4aaaf9e9ebdacc055192e95ea101388ef73
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the creation of a link farm or SEO spam, with numerous external URLs embedded within the document. The document body, though heavily obfuscated, contains a title related to 'fastest horse in minecraft pc', suggesting a lure to attract users to potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=what+is+the+fastest+horse+in+minecraft+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5fca74a183032.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/3798994.pdfIn PDF document text
    • https://bixarina.weebly.com/uploads/1/3/1/0/131069915/sorolobitovetuzuboz.pdfIn PDF document text
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/losiwewaru.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/bufenevugifuvozezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5fdb6df27f825.pdfIn PDF document text
    • http://termometr-medikal.site/26542869373pg7jz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_5fe3818a34319.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/zilewokuzukaxavim.pdfIn PDF document text
    • http://lovelid.xyz/download_game_my_tamagotchi_forever_mod_apkdebh1.pdfIn PDF document text
    • https://jarufepijup.weebly.com/uploads/1/3/0/7/130776730/78939ec3315671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445331/normal_6004e5da29b92.pdfIn PDF document text
    • http://fashion-deals.xyz/derifugobop53gwc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geradi/kunajemebepobopodisu.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/pratiquer_l_orthophonie.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/history_of_computer_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/88067644163.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/br_answers_yahoo_com_question_index.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/6th_grade_problem_solving_worksheets.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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 5236 bytes
SHA-256: 5be07b9df686bdc1cb8ce54053c6753d3ed921538adddccd10d9fc8b61b636ca
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10996 bytes
SHA-256: 69a7e9f2e335bd40ca42f3dea1f7fcebadb8b52dd3f6dfe6e5002f39272a1df3

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