Malicious PDF — malware analysis report

Static analysis result for SHA-256 871fbeae7a8a9cac…

MALICIOUS

PDF

84.2 KB Created: 2021-02-20 08:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1451c37066e2e4a6331ce8b799c4c1c7 SHA-1: f7e1cd64f951ef037810c2ea79a777c97480aa4b SHA-256: 871fbeae7a8a9caca65247bb8a1eb389612ab9a30a3ac3cc8b6faae8abd11154
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'sat training classes' and mentions 'wkhtmltopdf', suggesting a lure. The presence of numerous external links, including one to 'bologen.ru', indicates a phishing or redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

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://bologen.ru/123?utm_term=sat+training+classes+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ffc749163fd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371247/normal_5fce51bcc77b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446636/normal_5ff2d2323ddb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501514/normal_5fcb70496c649.pdfIn PDF document text
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/228155.pdfIn PDF document text
    • http://sikutamilom.iblogger.org/motu_patlu_cartoon_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gazivemon/dragon_quest_11_octagonia_casino_cheat_sheet.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/10159396765.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/die_wichtigsten_chemischen_formeln.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/lefisajugakoduvuwot.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/70498107668.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/ms_access_embed_report_in_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/botanic_gardens_and_parks_authority_annual_report.pdfIn PDF document text
    • http://novumejam.epizy.com/71828016018.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/gitukulute.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/14243843500.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/lukuxexodukegafilusavuxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 4900 bytes
SHA-256: 1983a8ab9ba04bee0f92bae08005225affbd7c49ff2f33a1a34ffd6b87870ac1
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 11336 bytes
SHA-256: c31cf4d16cb95ef3a79332b89fcdcb339988e97a80d3f23dad06eaf99038a743
font_02_sfnt_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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