Malicious PDF — malware analysis report

Static analysis result for SHA-256 810403e12e43ec8a…

MALICIOUS

PDF

103.1 KB Created: 2021-01-19 16:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4bd951fb8404292906ea25ff1546cca8 SHA-1: c8e1fa554c6c9fc12f60c9b7c3dc195eaabe8421 SHA-256: 810403e12e43ec8a51f164e0391376cd174cc1e3d9614b6b43f32310185c71f8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=institute+of+general+semantics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5fc372cc1551a.pdfIn PDF document text
    • https://cdn.sqhk.co/dinewemilo/1wjgghf/divifim.pdfIn PDF document text
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/nogidiwokebegux.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/jebak-rarelupizo-tigovugixisafar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5ffc34bd554c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5ff8c02fd83d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fc93cff73e13.pdfIn PDF document text
    • https://site-1175847.mozfiles.com/files/1175847/kekavafidafusekepexiv.pdfIn PDF document text
    • https://guzuwifaxad.weebly.com/uploads/1/3/4/0/134096987/7140082.pdfIn PDF document text
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/cd7e50258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5fcecd44db42e.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/dhffhin/translate_web_page_firefox.pdfIn PDF document text
    • https://bazigumaxofiz.weebly.com/uploads/1/3/5/3/135383162/lagafanuborusag.pdfIn PDF document text
    • https://site-1209810.mozfiles.com/files/1209810/lanoxoxogonoged.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/genedonapubefe/lavevif.pdfIn PDF document text
    • http://laboluvimaniraf.epizy.com/bmc_full_form_marathi.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_off00015882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15882 5140 bytes
SHA-256: 12b50696226036ec3949593325f58be72a7ad9669671cd7d436c8a7a8a9865b8
font_01_sfnt_off000169ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169ED 11036 bytes
SHA-256: b81d9afa29bd620a6ff1da1c300a398378d93e0c3d7fbf93133735588e23e6b0

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