Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f082aa2ef70dbf1…

MALICIOUS

PDF

65.7 KB Created: 2021-02-11 22:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e82c9350557a7ca6ea5071e544e724d9 SHA-1: 1b9617213bc7ae22fefa0aa568080ce51c895864 SHA-256: 3f082aa2ef70dbf1cf0e8a6f8bae2edc43b09924a33d43bb216719a7db97c606
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 0.9998

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://crophysi.ru/wix?keyword=cell+matching+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fcd1f1d48473.pdfIn PDF document text
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/9544893.pdfIn PDF document text
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/lewab.pdfIn PDF document text
    • https://finiruxadaral.weebly.com/uploads/1/3/2/6/132680938/3340607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fd8a0b5ce80a.pdfIn PDF document text
    • http://nibobokil.66ghz.com/39113233365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379616/normal_5feb26d22cd4c.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/LYkTihj/green_pumpkin_painting_ideas.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/kamimimixusawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471467/normal_5ffe5a1cdcddf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_6000d87a841d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5ff19256346cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401983/normal_60066d93c17b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetusadesaxoni.rf.gd/actionable_data_information.pdfIn PDF document text
    • http://lujubozugib.epizy.com/bangla_news_video.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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 5272 bytes
SHA-256: d2dedfa69ef70210fa6bf89b36bdcc04e64fa6be6f7f43eb151d3294aa8e879c
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 9488 bytes
SHA-256: 3a62fcb9f7a341de26fa52510b9b54e6e4c17d8043f4db53f074a697242dba67

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