Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fe7c74b072cc0f…

MALICIOUS

PDF

92.4 KB Created: 2021-02-04 23:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 05cfaf13510fd7013ede905979bbc18d SHA-1: 7e3cd301e78cc63d0bfbfeb7ffe60067dbc833db SHA-256: d8fe7c74b072cc0f4e0cc047230f8eabbd44f32c24839963cf33b9a1aa9b009f
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains numerous embedded links to external websites. The heuristic firings indicate it functions as a link farm, likely for SEO manipulation or to distribute further malicious content. The embedded links, such as 'https://crophysi.ru/wb?keyword=sqlite%20data%20types%20date%20android', are designed to redirect users to potentially harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=sqlite%20data%20types%20date%20android In PDF document text
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/nekudafarafik.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/zivozizorem.pdfIn PDF document text
    • http://kinokaiff.space/chi_square_distribution_examples_and_solutionsisui4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5fc78fac3211c.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/tixupusu_dumukibabulebox_xozifefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5fcac94a3825e.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/10fcde54cbdf8a.pdfIn PDF document text
    • http://levelupguild.com/pokemon_heart_gold_goldenrod_city_team_rocketofq09.pdfIn PDF document text
    • https://vipofobusaxipol.weebly.com/uploads/1/3/4/2/134234766/f07e5d.pdfIn PDF document text
    • http://registrat.space/lelufomuzal5veak.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/2800402.pdfIn PDF document text
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/dipise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafovito.rf.gd/besanezekudalikujej.pdfIn PDF document text
    • http://midelex.epizy.com/passar_backup_de_android_para_iphone.pdfIn PDF document text
    • http://rezumasalimod.epizy.com/1706436736.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_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 5284 bytes
SHA-256: 79577148a74c1d01f0519793fdb4766742c9a102074b594df9cb1acc54c40162
font_01_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 12756 bytes
SHA-256: 539f972b6c2cd2d9b21bf8cd1a4a1973b6292ea2049f7f71ecc9696c63e3e1c1

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