Malicious PDF — malware analysis report

Static analysis result for SHA-256 f891ad33d6210698…

MALICIOUS

PDF

68.6 KB Created: 2021-02-05 05:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 36db9014b51a7b1a46f7c753c1831204 SHA-1: 71956ead6b731972abf2d800f3530595ccf57981 SHA-256: f891ad33d6210698aaa3f1f2f6624582106de32daff2b19cc4391add87eb1df0
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, suggests a lure related to 'crash course psychology video worksheets'. The presence of a large number of external PDF links, many hosted on Weebly, points to a link farm strategy to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites or download further malware.

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
  • 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://seumenha.ru/aws?utm_term=crash+course+psychology+video+worksheets PDF link annotation
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/5035137.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/pajepewiwaxo_wuvuliwegisitum.pdfIn PDF document text
    • http://ibkreactiva2020.com/aruba_ap_365_datasheet4kxrk.pdfIn PDF document text
    • https://mamonaxerif.weebly.com/uploads/1/3/5/3/135347384/pewobalosunasoges.pdfIn PDF document text
    • http://comp-arenda.site/92416505091xipsh.pdfIn PDF document text
    • https://degubazof.weebly.com/uploads/1/3/5/3/135304991/jezaraw_wagezupi.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/wawivudas_mileruf.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/8f3a956af56e99.pdfIn PDF document text
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/4230588.pdfIn PDF document text
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/6000987.pdfIn PDF document text
    • http://easylearning.space/chevrolet_bolt_review_consumer_reportsxvw71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fdc5f91dfa0d.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/zafirawit/84541476379.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/attendance_allowance_form_postal_address.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/bottom_bracket_cable_guide_halfords.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/73885439366.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/58603639843.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/68892648992.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/63798378484.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_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 5560 bytes
SHA-256: 3635ecce30f8e58077177954e75b2bb957ef2b6a183de417c0fad872b6122ea1
font_01_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10852 bytes
SHA-256: b56777b1cb7e0008ce21010dec514c48d05ec4d79bd955169f6393fad4fb3e0c

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