Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d8b4d0f921bdde…

MALICIOUS

PDF

79.1 KB Created: 2021-03-08 03:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3cdc4eb6bb8d88052a758ac4115a8b16 SHA-1: 4353348549dbf7d7341ae643d7ab66ae4e2b9e7a SHA-256: 24d8b4d0f921bdde86e4d801d859d12099ec705e460c5edf368fb08e27c2ccf8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs, such as 'https://midufefew.ru/wix?keyword=dermaka+skin+cream', are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=dermaka+skin+cream PDF link annotation
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/jikaxanusiso_widuduborapef.pdfIn PDF document text
    • https://cdn.sqhk.co/daruluneti/hjdVSgj/change_taskbar_color_windows_10_registry.pdfIn PDF document text
    • https://xijegubusogo.weebly.com/uploads/1/3/0/7/130739006/97479.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/jbihOyW/amazon_music_unlimited_student_cost_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/Jhehiii/aesthetic_wallpapers_blue_stars.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/bgig8ib/business_day_calendar_2021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5fcbf82d49e2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5ff7c87f8abf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5fdda42bae0f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_603f482a17c98.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/cEexNjb/voxovebepanofosesetom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fcc22ce7acec.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/d5488dcf-d549-4b98-8c75-dc1f6c2e4ef2/brother_dcp-7065dn_toner_low_reset.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_970b8a4a8a1a4f59984d88e6759f7348.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_feaf64c517ce4192bd9692a42cf7278e.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_ee9c3fa7c3b540178ec2827ed835e779.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_2052d5ec53814e6384979828a264542c.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_06e7fd98486c48a5a57b53fea57287cc.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_0a17acbd63104552a54e60fecaa8cfc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37be33ee-022f-44bb-96b2-6f56bb680e25/vetigipedadiwijiweluliwi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 4976 bytes
SHA-256: 6beb70f6305818eb34ee74f84c022a5c55a9804992d9506bdfcf4431b861213c
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 2004 bytes
SHA-256: fafadf52bce8236c034e95e7d90fb5d1ea6412f048cf5a54038d6689a327062d
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 11288 bytes
SHA-256: 908cf716376ba7f0c608ce7a34f72e2e5e851be0ac43c473deb73eceed18f8b8