Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f333811cce661c7…

MALICIOUS

PDF

69.1 KB Created: 2021-05-22 23:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0d82306d3df5120793b16d85ac43de9f SHA-1: 4db4e5029508c6cd15abbd93af81780ac0a3ad12 SHA-256: 4f333811cce661c71b525baa00af62a9c3a8fdedf413204d0720f17aacf2c9d1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on a suspicious domain 'dugedepap.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and redirectors, suggesting a phishing or malicious content delivery scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://dugedepap.ru/strik?utm_term=palme+kimya+konu+anlat%25C4%25B1ml%25C4%25B1+ayt+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403804/normal_5fee9e63425dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_601b2a7e3c681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_605327409c2bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408707/normal_5fe2415813515.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/1123594.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/a23db784f2d68.pdfIn PDF document text
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/9919537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fd91d94c038a.pdfIn PDF document text
    • https://vumokaxizojomij.weebly.com/uploads/1/3/2/6/132680848/lalurexitil.pdfIn PDF document text
    • https://jafusakivamo.weebly.com/uploads/1/3/0/7/130739280/ba45fe6a.pdfIn PDF document text
    • https://ponukikoruxa.weebly.com/uploads/1/3/4/3/134343798/penuk-zagegejafonop-lepezar-vetumurezaloli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490757/normal_600454d125a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60402693726de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_6022d04b80f12.pdfIn PDF document text
    • https://zomatofaso.weebly.com/uploads/1/3/4/6/134633851/kajuxafabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374700/normal_5fc8018a912de.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/nowokil/city_of_bones_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453103db-777d-4332-a91a-a5d807304483/5139216577.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/lezidokekugos.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/bosch_silence_plus_48_dba_wont_drain.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/menotapabotepobonisopes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d57b150-7583-4906-8368-19a72c1417f0/the_cat_in_the_hat_returns_text.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/blackmagic_atem_production_studio_4k_switcher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bd93d5-25e2-40ea-9789-76294a1e0bf4/how_to_reset_beats_studio_2_wireless_headphones.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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 5112 bytes
SHA-256: 81c619171f4a355deab2572c895dafe674e545c6ca56b86fae2e0965ea7ab675
font_01_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 11852 bytes
SHA-256: 076f085b52d1a8be53cb3849daf7a7eb7e832a7f658c39869a01d86744ed2766