Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c477af99992a86…

MALICIOUS

PDF

80.3 KB Created: 2021-03-05 06:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1380369101721325647bee69b242c679 SHA-1: 179ed50d3c72357ccdd1e9db4c883c6054808965 SHA-256: 22c477af99992a86c99334aa1dbc6faa21023384ff6a9beb9e646eeed3777923
186 Risk Score

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 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 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.
  • 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://botokaw.ru/strik?utm_term=kenmore+coldspot+refrigerator+size PDF link annotation
    • https://cdn.sqhk.co/womibakok/V7msTtF/subway_surfers_java_game_download_128x160.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/iqchhid/benuz.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/bghiidV/mikerofitenofakirajebatuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xasomegupur/hiCA9wz/28969819299.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/ziejiKP/nagojilorilolexapofuxowo.pdfIn PDF document text
    • http://sukotis.iblogger.org/free_birthday_invitations_with_photo_templates.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_3a5d4977ae3a45e2a8584f2dbddc87aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/521caa9c-1da2-4220-a24d-eea6076bd35c/ps_vita_2000_new.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbc974a-77d4-4bd0-9038-09db8ace0551/xuwuk.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_982c64bb8ab842c89a1dd3199456d742.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_f596507c24f44f86a53990e94a9d7992.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aed3c90-2db0-4802-a9b4-9689033ce8e6/xawekodujaxujukagesura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a584dff-d162-4411-9060-bc9c34ad3909/66970275713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8756498c-5af2-4acb-8e6e-c81ce70639f0/algebra_2_textbook_answer_key.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_ffd47b2d34ac46fa88a96f6129ede028.pdf?index=trueIn PDF document text
    • http://liwununigu.epizy.com/55695638252.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_4bdbea3c97da47d4ad08b030079f300a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6960ea8-5146-44f0-9e66-dcba89e532b2/42753287394.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_cbc39b7a5b33415984c1020e7478e5b6.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_a5e90c5974274b6b93a27f9b02e47e76.pdf?index=trueIn PDF document text
    • http://lililaresijunu.epizy.com/logitech_x-530_subwoofer_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57344ba-e25c-45c1-b3a7-dbf202f8fed0/57146627055.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_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5492 bytes
SHA-256: 87321d104c4336c8175a573d449c594e95e0dd4f5c70d8b16b296c56038e5090
font_01_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 11108 bytes
SHA-256: 8ea687a4f809866717df93c13a29b17e946d8d658138972e9cd7261e0e94cfeb