Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2dcd34566d6392c…

MALICIOUS

PDF

80.0 KB Created: 2021-04-05 21:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4675b5f5922168427c0f6e5ed22398f9 SHA-1: 55a5961b35e814b56774d45d23246e0e0fcc2cd6 SHA-256: f2dcd34566d6392c5f214face273af2eae95d0085e6c26c167c334930919b721
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. 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
  • 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/award?keyword=exercicios+sobre+balanceamento+por+oxirredu%25C3%25A7%25C3%25A3o+pdf PDF link annotation
    • http://lukaruji.iblogger.org/acute_anterior_uveitis.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/dabup.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/kilunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_60636a090b989.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/nokapufezorerisika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491410/normal_5fe2b2a0b0fad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5ff8af2d5c976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_60341b03c91d5.pdfIn PDF document text
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/pipigi_kebaposuxawabul_dinavuxuxadejez_pajoladod.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/37327019810.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/nekujivakowawikod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459176/normal_5fcb4b5aa5cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_605a974219aac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://motiwop.rf.gd/radio_thermostat_reset_button.pdfIn PDF document text
    • http://podadanojiwa.epizy.com/42577253254.pdfIn PDF document text
    • http://vibexezesi.epizy.com/aidin_salih_gerek_tp_indir.pdfIn PDF document text
    • http://mujozigimak.rf.gd/respiracion_aerobica_y_anaerobica.pdfIn PDF document text
    • http://xugojejusovofeb.rf.gd/vuvufewoxenorimelupusuje.pdfIn PDF document text
    • http://liwetagosozel.onlinewebshop.net/a_horseman_in_the_sky_summary.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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5964 bytes
SHA-256: 72f06d8ccfb0d0dde518cf3b693c21f019685d587cb748e8f61a2446fbe883b9
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 12912 bytes
SHA-256: cdbb26350e64a55c85f5dfc45a7dad4121e10c21a3f1396234c3ea8c94a35238

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