Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e9e67f32e01460…

MALICIOUS

PDF

94.0 KB Created: 2021-03-18 04:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa52c36b435c15a9fc325bf039bef16b SHA-1: 09bc9cc7085925a3c199aa9bc8faa10ae51d4387 SHA-256: c1e9e67f32e0146076b05eddc4dd3da52690ff0dfcc744de7c38a8de4187a395
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=acutronic+fabian+ventilator+service+manual PDF link annotation
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/e6387df54ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_60343a358d6c9.pdfIn PDF document text
    • http://prognoz-football.club/free_prayer_books18w6z.pdfIn PDF document text
    • http://physcoo.com/wikaji1vg99.pdfIn PDF document text
    • http://fb-ig-violation.com/jedasusotisarunazibanudiocu05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5fc712c79e05f.pdfIn PDF document text
    • http://lg-copyrightforms.com/zusibujugdga2s.pdfIn PDF document text
    • http://show-visitor.xyz/103j_capacitor_datasheetyhq32.pdfIn PDF document text
    • http://cardio-active.site/subedigujamuzufoxurd8ye7.pdfIn PDF document text
    • http://korecos.ru/common_core_math_worksheets_6th_grade_ratios8svmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600b27f45358e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_6026d6bbc71cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fdfab3270af2.pdfIn PDF document text
    • http://ejinaya.com/reading_words_per_minute_chart4q735.pdfIn PDF document text
    • http://shoop-fo.ru/rules_for_adding_and_subtracting_fractions_with_unlike_denominatorsop5js.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_6029ef603af81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_6043dc5a14e23.pdfIn PDF document text
    • http://hdsamara.ru/vagojuforagerazalilol3pvuc.pdfIn PDF document text
    • https://gowoxavakuf.weebly.com/uploads/1/3/4/7/134702457/safodafofarunanegus.pdfIn PDF document text
    • http://okrasote.info/11446094037hdwa2.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 1872 bytes
SHA-256: 9fba9b0d9e2cc48f58c52755440c9a9bb3bd4c5dbe3d8c853d7e81cca7fbdf20
font_01_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 5100 bytes
SHA-256: e20ee5317c2193fa50557256c10abe9116ce06e84532d9c74e00e415a5ed8710
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 11832 bytes
SHA-256: 7a488446b2864c0525a60c7386dff91fad610bf5658235160c67f14457ac3a5c
font_03_sfnt_off00015be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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