Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77506b9c1b6ede6…

MALICIOUS

PDF

92.4 KB Created: 2021-04-06 17:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c21bb8dbe91920da5d5779184e275708 SHA-1: d7dc1f1158188512227c7d6a9d33f61019346509 SHA-256: d77506b9c1b6ede64a47e35e0a5c6aa4548761e417bd568ffa58a2131d1d7201
194 Risk Score

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/aws?utm_term=the+modern+corporation+and+private+property+1932 PDF link annotation
    • https://cdn.sqhk.co/bemoranoz/m9hd89B/oreo_icon_pack_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/8iihhHN/90976394458.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/ropuremafamujip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5fed104a4d83f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fdf6cd812073.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/hjjgjkE/40104852757.pdfIn PDF document text
    • https://vifozafep.weebly.com/uploads/1/3/1/4/131407061/matomozelowepa.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/3457217.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/6816188.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/74a63fafed.pdfIn PDF document text
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/527b5e75.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/6117252e2.pdfIn PDF document text
    • https://sudomudes.weebly.com/uploads/1/3/0/8/130874284/4602752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6027cb9f564f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/ihih8SB/adafruit_audio_fx_sound_board_schematic.pdfIn PDF document text
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/rotixesujijom_sugogeze_duvirawumirowa_zilapisigu.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/1141923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fdd8357c27a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bced28d-fa2e-41b3-aa57-6fcfae986db3/50464178342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7aebc9-fc55-43d4-b8d2-ef830c73bf1b/how_to.cite_an_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b29119c-62cc-4729-aec4-63b652631f33/16499187939.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_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 5716 bytes
SHA-256: c7e77cd7b7d0c30b3c05d628d1cf200467233dc449b3364c4d3d6dbdcf8bd57c
font_01_sfnt_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 11752 bytes
SHA-256: b6c45eb01a2350aeb1dc77d640260d91915234f2f99ec3d1d2fcad7c97d040f0