Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f32bda1d6559f1f…

MALICIOUS

PDF

78.7 KB Created: 2021-01-08 15:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 537db70f3e1848ceef8d2044ea06c5eb SHA-1: a2d216e70ff311233e27b96e0978db9b9ef34a24 SHA-256: 9f32bda1d6559f1f3f15950e4d026ed8ee01f31793cb19aec46eada39d7c6e8c
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'classroom management books', likely intended to trick users into visiting the linked malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=classroom+management+books In PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/63f2ac7dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_5f948ef9a3753.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/saniwa-gukikenale-nilarevuwuge.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/vifusupegiza/mupiximavusolisetobisebeb.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/zonilufevomunaxafisupod.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/nadavubixomiwakutuweni.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/wijobiloju.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/woxenakawawora.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/venetadujuwugiwadumakiro.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/60052537460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31495cdb-1619-4333-8dbc-5c48eb9cccc5/dept_of_navy_issuances.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/nesuropilerez.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_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 5112 bytes
SHA-256: b850640681ad45741a60a9ef1313ee0326d5c70f97b48ea75b97bc2880791158
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 10632 bytes
SHA-256: b3489e54fd73b1acec968de5253b1770d4592f2a4cee1f72911e6d3b382ea48e

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