Malicious PDF — malware analysis report

Static analysis result for SHA-256 da620626bb552c5a…

MALICIOUS

PDF

90.9 KB Created: 2021-02-02 07:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ed2450633c32c14b44940b20fdfe2bc6 SHA-1: afa3f2cb3efa209d2d9835bef7fc3a441eaf9444 SHA-256: da620626bb552c5a1fdcc1741eec1ff6a438a1eb36fca984471b03c4e1581944
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://leonvi.ru/aws?utm_term=a+discovery+of+witches+episodes+guide PDF link annotation
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/xakurijamob_xofidofo_banirolul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_5fdbf7b0b9e77.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/b1563f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459028/normal_600152396c314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_6016faa5285fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fe64e040dda0.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/i2jhbjb/60183426905.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/ejcU4gl/espn_fantasy_football_rankings_2020_cheat_sheet.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/456780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464735/normal_600d4564e3c0b.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/jaEiKn0/63799631582.pdfIn PDF document text
    • https://bovopoboj.weebly.com/uploads/1/3/0/7/130776351/fexulek-fezekavi-mufedupekore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fcee5f730b90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448337/normal_60044c678a540.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/hgiji6A/electricity_meter_running_fast_complaint_letter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484376/normal_5fe716264a8a1.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/gchegg6/euro_train_simulator_2_app_download.pdfIn 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://rewelasiv.rf.gd/alphabet_flash_cards_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/beats_wireless_earphones_user_guide.pdfIn PDF document text
    • http://gebutetivifupa.epizy.com/m._b._a_course_full_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 5192 bytes
SHA-256: 3b6426be25b900bf7381c5fd433dc8aa5f0f68fb58c71a30eef9be1f524d3f8c
font_01_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 11820 bytes
SHA-256: f1a4e195eb6196aa107487caee3a2b74c8827076ce0501f4bcc05cc225fec705
font_02_sfnt_off00014fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378