Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fee01f3dc62717…

MALICIOUS

PDF

80.3 KB Created: 2020-12-07 12:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ee33b04fca2614f9c1572e3d492fb32d SHA-1: dddb6d622090f51074f61eb49cd491b47c17ecd5 SHA-256: 53fee01f3dc62717f938f26997a673b0ac3f359a1eb8840c82fdb7bc95c0ef87
172 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically mentioning urgency and invoice/payment themes. It embeds a large number of external links, with one suspicious URL, https://traffking.ru/strik?utm_term=my+uiuc+housing, being a primary indicator of malicious intent. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffking.ru/strik?utm_term=my+uiuc+housing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fa31e7738eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f9f3305574b7.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/supegaf.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/8701653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499622/normal_5fbdbd8282dc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67866e2-2ff3-4a80-bc0d-a734f7397776/93432330020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61795839-bcf7-4d38-b602-f8a7bb1e2a47/explicit_formula_for_arithmetic_sequence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3ac956-5046-4d35-a057-5aa1c761636b/geminu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350baefa-baaa-4909-a4bc-a0fdb2e5ea9f/49114097857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39c9ba0-5caa-4da6-80cb-bbde20aa13de/oso_easy_roses_lemon_zest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/356829f2-7432-49b4-973b-99cef3c3a0d0/campanas_por_doquier_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4932d2b-c307-4074-aa0e-c27f5815d017/i7-4785t_vs_i5-4590t.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4c395147b14804297218/1606372410160/ground_elk_recipes_pasta.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 4828 bytes
SHA-256: 2b49e64f2245f73d83a496ff0d77fa6fed07256adbfa98368e7788bed11e511a
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 11336 bytes
SHA-256: 9fe9ebee81ad73cae245677384d48187b7a94ab11b3d81c48760319bff4d02d8
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6

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