Malicious PDF — malware analysis report

Static analysis result for SHA-256 16af4edf6d9e8d1f…

MALICIOUS

PDF

78.2 KB Created: 2021-01-21 11:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4bbab88996e704ccabacec01ed203324 SHA-1: 9df0046a4f730dfc6a67ce71a1056cdec3afdf28 SHA-256: 16af4edf6d9e8d1f652375b1449d8393436fdde65c99e757decb25b7169d5317
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 of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure for spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=muscular+system+worksheet+printable PDF link annotation
    • https://site-1215102.mozfiles.com/files/1215102/16256649517.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/wish_meaning_in_english_grammar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f9aba0d38c55.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/hdVRgch/easy_basketball_shooting_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/hiUjaid/game_genie_nes_for_sale.pdfIn PDF document text
    • https://site-1171608.mozfiles.com/files/1171608/luwus.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/ghey5ie/nejuluwovaferezukiveru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fccb2ad2e3e8.pdfIn PDF document text
    • https://site-1195801.mozfiles.com/files/1195801/58815426960.pdfIn PDF document text
    • https://site-1176903.mozfiles.com/files/1176903/photo_music_video_editing_software_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/5hh2geA/kuvogirijepedevexu.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/ifPgchd/4930542783.pdfIn PDF document text
    • http://vuxokiwi.22web.org/baccalaurat_en_informatique_uqtr.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/kuvugakebamepa_lefewuxew.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/9625111.pdfIn PDF document text
    • https://site-1217518.mozfiles.com/files/1217518/58824501437.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://xebowuruno.epizy.com/jexamamarirolepofen.pdfIn PDF document text
    • http://dovobol.epizy.com/27528468372.pdfIn PDF document text
    • http://mafixatoje.epizy.com/51149193853.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5456 bytes
SHA-256: e59658030868ddaa24a79b42489e92fd4936ef7ab4791d6cadb856203ed9b2d2
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10520 bytes
SHA-256: dea9c28f153e850ed61d74cd163a47dad8434318216e1cf2618b58431dc59435
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378