Malicious PDF — malware analysis report

Static analysis result for SHA-256 41610eab43f2afcb…

MALICIOUS

PDF

74.4 KB Created: 2020-11-10 10:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0477e34d8336e85894341b58e52d8be3 SHA-1: 762e77c89a8d1efcf9bbbb4916140af83f2dfe64 SHA-256: 41610eab43f2afcb3b1563b6db7b6c3001cbe6bc05a451973e0999b3dc5e3ae7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://traffset.ru/123?keyword=arc+length+calculator+with+pi', suggests a SEO manipulation or phishing attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffset.ru/123?keyword=arc+length+calculator+with+pi PDF link annotation
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/xupomawogupum.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/nisoxow/instantaneous_speed_formula_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c367ec5e-d486-4a0d-8c78-669aa747f514/powerdirector_12_free_download_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc69bac5-a1de-4b56-be1d-d48288e53cad/gigopewekibivaber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f0306d-a046-44de-a439-08e5602838fb/japuxika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ec2748-b1bd-4180-a416-b3aea5e6d24f/wujulawamerixomojotodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2760dc-891a-401d-9366-bf5efd2cdc19/reluxuruv.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/lisoxelizegazizevofiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/xubokegonipuvovatasabej.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/gaseguwuxigekaripazeguto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5477f1-893d-467f-8aaf-255329c16d35/laremajevutefesepot.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/88486565562.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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 5100 bytes
SHA-256: 82425e17c67608c2020d77bb695f40f7ef6349564817afacbe6ddd46b3099650
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 12580 bytes
SHA-256: 860989f5fe8201e7cdb942e993cbebc1ab5ea1664b98ab660233d13cc224066c

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