Malicious PDF — malware analysis report

Static analysis result for SHA-256 2159d2f528b56f34…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 00:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 69260786f9aa3fdd8ee39abd0f415a42 SHA-1: 517c34e8b696706c92ed245acb97cedba69d13bc SHA-256: 2159d2f528b56f346213d0e0a679b6dee227557455b2c76af5513b10d684f90c
184 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, indicating a phishing or malware distribution attempt. It contains a large number of embedded links, many pointing to disposable hosting or redirectors, designed to lure users to malicious sites. The presence of the URL 'https://dafemum.ru/wix?keyword=enzyme+webquest+worksheet+answers' strongly suggests a phishing or scam pretext, likely related to the document's apparent content about 'enzyme webquest worksheet answers'. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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.
  • 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://dafemum.ru/wix?keyword=enzyme+webquest+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4455381/normal_5fe27ce8b06be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489980/normal_605872f7f0fa7.pdfIn PDF document text
    • http://vanibunogi.iblogger.org/grimoire_of_tiamat_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_60547c45c847d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_602d732ca6b52.pdfIn PDF document text
    • http://litifafoj.iblogger.org/ti_nspire_cx_online_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_602cd9d0d42b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonetone.rf.gd/grand_opening_invitation_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9a95fe-5008-4aea-9595-88dd8821d106/dabujulazefisesogepibol.pdfIn PDF document text
    • https://5c51e3d7-2896-491e-a255-1b002e356b93.filesusr.com/ugd/5b6ce5_df9109edef534717a602d57f510073a1.pdf?index=trueIn PDF document text
    • http://wetetepipemo.rf.gd/17229793588.pdfIn PDF document text
    • http://zezogif.rf.gd/kefobulimapafutamowixi.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_c408581aeb954c1cb364fb61d35ed66b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6cfb34-9268-4663-8559-6ec63190c5a1/sogibuniruruletod.pdfIn PDF document text
    • http://vikipabolukizi.rf.gd/camera_expert_apk_free.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_58a0d43e940945f791750a12cd22c5c4.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_1db037ef4705466d9d936232b0c4dacf.pdf?index=trueIn PDF document text
    • http://xivubijorudi.epizy.com/46112127089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc352ebc-af49-42ec-abde-3476444620a1/45770737923.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_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 5424 bytes
SHA-256: 7f5e1e841e2b7aeb2f816ec4bca5ae5bcad6add880b51a313e1aad12d777da59
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 10800 bytes
SHA-256: ddc11a3f96c8af2abdeee9c038de4c15dff9567d400b2b56b75404c60178f48f

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