Malicious PDF — malware analysis report

Static analysis result for SHA-256 288a2eeaf23f1981…

MALICIOUS

PDF

72.2 KB Created: 2021-03-02 01:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 13cafbf50a63cb9bd4952aeb9c5275d3 SHA-1: d73aac853e281efdc0a2c1560d2c0ad85e041316 SHA-256: 288a2eeaf23f1981c73e0fd4a2814da4a259b1719888e29286ac49bdbc064533
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=return+of+service+on+subpoena+iowa PDF link annotation
    • http://rostov-mobile-doctor.ru/endless_night_novel_downloadtga8q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fedcad2b5ad4.pdfIn PDF document text
    • http://arendaavto.taxi/local_buy_sell_trade_siteswoyy2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_6024c38010b60.pdfIn PDF document text
    • https://jexuleni.weebly.com/uploads/1/3/1/6/131637506/fagek.pdfIn PDF document text
    • http://copyright-services-us.com/leselofabi2c5qr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_6019142d53268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5fc7e78a338c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fc7683637ab9.pdfIn PDF document text
    • https://cdn.sqhk.co/ximirujusuxo/gfjgjj1/tujeror.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/UChhjfb/free_bitcoin_btc_miner_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_6028b90e2b639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ff40d2c37d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5ff79cf7a23ee.pdfIn PDF document text
    • http://nutristrike-shop.ru/zombie_killer_squad_mod_apk1ompx.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/nodetuxapabara/49267016213.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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 5276 bytes
SHA-256: 0a02a045ed882bf69e8ad21851b206ef7f2dd5ed4fd3aac0fdddf7ac588141cb
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10044 bytes
SHA-256: c797eef2e359108d18b5dae489d48db2b244310e13ea0679af7bdae74a86ce93

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