Malicious PDF — malware analysis report

Static analysis result for SHA-256 97885533db2a2d3b…

MALICIOUS

PDF

77.4 KB Created: 2021-01-19 00:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9e74ac19f5d89801cffbb17a22b9cb71 SHA-1: 67b423f9713ae38f673ec9bfd8912c6353de8a18 SHA-256: 97885533db2a2d3b2161236ac36c43f496054d8cea6b3d25a792fc5943f39a36
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/123?utm_term=imperialism+case+study+nigeria PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402953/normal_5fe2eb0643b62.pdfIn PDF document text
    • https://gozibaduvixumu.weebly.com/uploads/1/3/4/6/134628844/wivugujel-suzinogemekij-buduxedor-vubov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5ffa92f78a1f0.pdfIn PDF document text
    • https://site-1245392.mozfiles.com/files/1245392/c_o_m_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_5fa29db761bd7.pdfIn PDF document text
    • https://site-1195328.mozfiles.com/files/1195328/24463615396.pdfIn PDF document text
    • https://site-1258606.mozfiles.com/files/1258606/walmart_king_size_platform_bed_frame.pdfIn PDF document text
    • https://site-1257572.mozfiles.com/files/1257572/29125375248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5ff08193cd772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5fc11c311cad9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5fcfe71ac5676.pdfIn PDF document text
    • https://site-1228032.mozfiles.com/files/1228032/non_emergency_transport_request_form_ambulance_victoria.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/85727713853.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
    • http://wepexivir.epizy.com/7840229249.pdfIn PDF document text
    • http://zusewijoje.epizy.com/91026968281.pdfIn PDF document text
    • http://wodefelid.rf.gd/basic_assumptions_of_economics.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 5204 bytes
SHA-256: 675820d03a63c118a74571de720ce33d11ba2ee8b4b786bde7ffb47e82011603
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10708 bytes
SHA-256: 45451c079ed105186d84b6ae0b58773e06b7bd95c1eea6cad4c88373f36901c2
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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