Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9875617c056c012…

MALICIOUS

PDF

75.7 KB Created: 2020-12-03 10:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5ca45e547ae7f14cc9c3c836c86d900c SHA-1: dbc880dfd8e0448f0f6ca13270c142f8151bd44d SHA-256: c9875617c056c012e88640c555c19bf42ff32f10ae7b81fedd22a9c0da31eb31
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffmen.ru/123?utm_term=tf2+sprays+folder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5f933e3dc3e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5fa282d420721.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/zatawokabuvapo.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/waxejajinigafu/tilagarijapenerutijag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5572b79e-0f3e-4885-ae09-4fa07c764c7e/essie_in_stitches_nail_polish.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/career_in_commerce.pdfIn PDF document text
    • https://s3.amazonaws.com/rovotafavap/learn_to_fly_2_hacked_omega.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/electricity_crossword_puzzle_answers_physical_science.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/dozex.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/jikoxotabetinipetotidoti.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/animals_of_farthing_wood_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/oxigeno_disuelto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bd71b2-cd21-4a12-b34c-bf76aae70caa/on_golden_pond_play.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/types_of_bible_study_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/45423533854.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 5216 bytes
SHA-256: e21614ce3f2b0b4e14da8690788d41890c8d43ba90790a3c8f00ed20324743a6
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 10936 bytes
SHA-256: b047926ad5dc73200d3fbacf5703dac03d853ba136af4762e6700e33b261efa2
font_02_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 16332 bytes
SHA-256: 2a247a753e8a01f70d7fcfa74e2d7baad7259a755652018209d99d19020bd12c

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