Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c18d6bc7c07e494…

MALICIOUS

PDF

76.2 KB Created: 2021-04-22 01:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a6f9a7b7b5f5d27271f1e9c6bb2ee29d SHA-1: 1560b44d536f6b7c90f6629dcb3056162889659a SHA-256: 0c18d6bc7c07e494c33223e6563dd4055806d45ced9f70e57d7212d029034d23
134 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. It uses an invoice-themed lure. 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 6

  • 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 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.
  • 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://golowaki.ru/strik?utm_term=can+you+get+riot+points+for+free PDF link annotation
    • http://alcexpress1.xyz/integrated_chinese_level_1_part_1_workbook_answer_key_lesson_6dpc55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fced7a18e9bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_600670e485f61.pdfIn PDF document text
    • http://datinge.site/is_there_any_nail_shop_open_todaywucxa.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/YhgjeNL/lazasiwuxowaj.pdfIn PDF document text
    • http://siankaanmexico.com/another_eden_tome_farming_guidey7mho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_60159ee622bef.pdfIn PDF document text
    • http://dapajibidamazed.mypressonline.com/abecedario_japones.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/30831898960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5ff4f15800c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_600b01190ec83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366959/normal_5ff7db73ee17e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5ffb83a1e41c3.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/aritmetica_modular.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/fefedisid_kagawasovozuv.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/jceTiJQ/74501456894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60410d917882b.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/pusurixujodarono.pdfIn PDF document text
    • https://lubagevaruzazej.weebly.com/uploads/1/3/2/7/132712663/fumawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_60355ec6a0702.pdfIn PDF document text
    • http://profoto22.ru/d-link_model_dir-615_passwordpqs6g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5044 bytes
SHA-256: c258861d699fa8a615393afdce55d561e324b81039cd4f219e79c43bc258eb77
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 11048 bytes
SHA-256: 8091db47e306c002adc67eacc9fce1d469d2b01d5e3f131b39cf7395d9c0d536

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