Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c34356f1cf1f2…

MALICIOUS

PDF

73.8 KB Created: 2021-03-02 22:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76f412d4285e384c11cbb34e5f776d92 SHA-1: 21258bd1b2a3df9bba105ab816d4808fd8a6b932 SHA-256: 720c34356f1cf1f259795c7682e37395c47970ba7ac65ddb3f78f1b70aeae123
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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.
  • 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://seumenha.ru/strik?utm_term=bear+archery+cruzer+g2+rth+compound+bow+package PDF link annotation
    • http://kawlites.online/dd_3.5_edition_bookayu9c.pdfIn PDF document text
    • http://uspex22.online/zombies_2_actress_nameqp191.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/77146252089.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/xexovage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fd2339176473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5fe79565da993.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff9d5ccb6da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_602fd8c93aba0.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/36134053625.pdfIn PDF document text
    • http://wetikufuwigiwox.iblogger.org/school_accident_report_sample_letter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_600f5ac01bd6b.pdfIn PDF document text
    • http://luvetikemo.66ghz.com/243559645.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/char_broil_turkey_fryer_accessories.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://lowefukoxoxegab.epizy.com/bigo_live_free_apk.pdfIn PDF document text
    • http://bobatinufej.rf.gd/padimilewapakonu.pdfIn PDF document text
    • http://pimubejat.epizy.com/chrome_browser_apk_for_android_2._3.pdfIn PDF document text
    • http://xexelakufakeze.epizy.com/realidades_2_capitulo_8b_audio_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 5740 bytes
SHA-256: 7a7a9755711a738ebf484213540b457b64aea1cb29a2498d2bbb41eaf8211366
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 12248 bytes
SHA-256: cf5e2a5c5d5f5d47fa857d972adc90b02685922425d35c4fb640ddcd4f69d3dc
font_02_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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