Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db264fa7d0867bb…

MALICIOUS

PDF

83.3 KB Created: 2021-03-15 10:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7c186aa8efef9179cbaf8c9133f291f7 SHA-1: b17da83e94b637bc985d5a8b594bfd50b44368fb SHA-256: 7db264fa7d0867bb77fd1aee4a8632b0f7e1b16382e4ff084d93040b21a2f13a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=can+you+reset+a+hisense+tv In PDF document text
    • http://1xbet-registrat.site/fobafafufojorimewogobatexikq.pdfIn PDF document text
    • http://instapriz365.site/pewidojubum3wgf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_604a88060a8f5.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/ruzeboxe.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/balapumiv-doxekore.pdfIn PDF document text
    • http://sport-stavki.fun/fiwiwinobiwugixu6r5wl.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/4c0e51ac7e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403127/normal_5fcab8edd3cf1.pdfIn PDF document text
    • http://goodsun.space/13450271573ioowv.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/50_shades_of_grey_quotes_funny.pdfIn PDF document text
    • http://ladyso.ru/51275866406o2i84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_3bb791eede684f53b3dd118a7e72131c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0053a3d-0943-4de7-ab09-8e3868dcb095/87346029867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9c6a37-0d42-441d-8385-2c6be845ef76/are_ryobi_drills_good.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_f62eaacc2700473d8a503c7d27bda440.pdf?index=trueIn PDF document text
    • http://dopovis.myartsonline.com/how_to_reset_toner_cartridge_brother_hl-3170cdw.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/sales_manager_job_interview_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 3800 bytes
SHA-256: cb455af8ef3617bbc6778bd73db14ab76f05964cbadb7ce2caf19a8f32bf7c15
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 4808 bytes
SHA-256: 6827da90cba484c1d6eb8f238dd134cfc47a0f5a06bba8a32176e770baf6a59f
font_02_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 10924 bytes
SHA-256: f8c7515b8c04486e6882408f374ee3be2497045280a74dfdbdd834ee05bbe5c5
font_03_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 16416 bytes
SHA-256: b1a7be413c16529a3efb36790fb1ede9dbc47b99b1dcf399fe3ce16d881d47c9