Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a7aaf0a27375db…

MALICIOUS

PDF

76.6 KB Created: 2021-05-04 13:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 351159517453337b32420d9640214b76 SHA-1: 75c7b213fb47a7e78eb79e7e3e7557baea7b08e6 SHA-256: 30a7aaf0a27375dbc97c09fdf1240c8f0b86d51877ba005248c479f86407a412
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-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://crophysi.ru/strik?utm_term=casio+fx-cg20+programme+installieren PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5ff1e9de9c916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453103/normal_5fe42565ef55c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fc9560027c3b.pdfIn PDF document text
    • http://sonasutos.mywebcommunity.org/9824672113.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/moxuzaxigibotagabomenate.pdfIn PDF document text
    • https://lupudeme.weebly.com/uploads/1/3/1/3/131378919/404601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_603295c6270bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5fe838772afe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5ff908603781d.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/85074d3c1821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_600fcac47340e.pdfIn PDF document text
    • http://tobafiga.medianewsonline.com/3517578931.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/cf99b8f6-c575-42ea-a5d4-0b16e1ea6c33/91706014348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf2b03e-90fb-428d-8b84-796bf8430469/hp_officejet_5610_all_in_one_price_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1957ed4-db0e-4a13-92de-2dba26191140/8509465203.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/excel_2020_advanced_filter_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afd785d-9b0c-489d-a86d-1ba2deaf583d/51914422453.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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 5616 bytes
SHA-256: 398e7eedeb526cbdf67155964dffd8a15c610ed2f0a3ed062094a7f592006417
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16276 bytes
SHA-256: a60c1abfee6e6a4cdcf2a6dc195589141eef1d2f4b16269265f72e504d0d6eec

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