Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ba11a6deaf11e3…

MALICIOUS

PDF

73.1 KB Created: 2021-02-11 22:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b14789e907b81927c4b77a7ea4c4c92 SHA-1: 1bf4af04dd03b95a2002317d56391cf3c648cf22 SHA-256: 17ba11a6deaf11e30927675dc21b0a97aa1871221cc0be8c644b5ce013503c6e
186 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and it contains a significant number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, some of which are hosted on disposable or potentially malicious infrastructure, indicating an effort to redirect users to harmful content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wb?keyword=math%20aids%20answer%20key%20function%20table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486550/normal_601f01503cec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_5fdc254fb0b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd284da12731.pdfIn PDF document text
    • https://bawimivumo.weebly.com/uploads/1/3/4/6/134609907/9294192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_600e498150b7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_5ff8ab8c76c0b.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/sifuwineguge_sipuranujiw_gugevukufagoduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60170f46de239.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455884/normal_5fee555cf311b.pdfIn PDF document text
    • https://xunedoworevesa.weebly.com/uploads/1/3/1/1/131164322/duweruwebasoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5ff4872638c1d.pdfIn PDF document text
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/titugisuruwo.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/sirugogaxi.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/xoribapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lisotabisalak.epizy.com/kuzulidabofiseropavobogiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/76804449914.pdfIn PDF document text
    • http://wiwawilif.epizy.com/bandicam_no_watermark_free.pdfIn PDF document text
    • http://lonuzokubezuva.epizy.com/id_card_photoshop_template.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_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 5512 bytes
SHA-256: cf4babf065bdf1b648f6832569cda22a0abc84f7cc15d0cf9595d5e28b09b7c6
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10408 bytes
SHA-256: dc27145bd1164ed087aed08d27f9544c14127692c47772a17daedf87d144ae70

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