Malicious PDF — malware analysis report

Static analysis result for SHA-256 71545ae2d8d5dcfc…

MALICIOUS

PDF

74.4 KB Created: 2021-04-29 16:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f060607608577bde6e724e0490ce9cab SHA-1: d6b54947575c1ee214faafdae6dd171d9d6dc801 SHA-256: 71545ae2d8d5dcfce10ccc37d089406b98fa2d57ea276a9c6d90201567dac8d2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=calibrate+acurite+digital+meat+thermometer In PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/aoXvRhb/anime_girl_wallpaper_hd_free_download.pdfIn PDF document text
    • http://hellochildren.online/damesolomojrzau.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/0c8fb7e.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/iflDgeE/79869919373.pdfIn PDF document text
    • http://ufenmac.com/13461725620vc6ea.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/repage-gurizav.pdfIn PDF document text
    • https://cdn.sqhk.co/lilajibusizu/eF3m064/601713551.pdfIn PDF document text
    • http://sdl-trade.com/le_corbusier_five_points_of_architecture_essaysoyvc.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/dVejgQc/sirofolafazej.pdfIn PDF document text
    • http://lifeeuro.info/19343471403cbh3i.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/aOPZ6m4/infected_urachal_cyst_mri.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/9572f72e.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/gghjhgK/can_you_escape_room_2_level_24.pdfIn PDF document text
    • https://cdn.sqhk.co/mojubemuwek/SjfMDQk/lips_done_3d_satisfying_lipstick_art_makeup_games.pdfIn PDF document text
    • http://aicberg.net/star_wars_ahsokaiup74.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/4XEVQhe/carx_highway_racing_apk_mod_revdl.pdfIn PDF document text
    • http://ductsunlimitedins.com/ancient_greece_religion_name8kq2v.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/985730.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/b8zzmha/cooking_master_boy_2019_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/jj3Xfvc/lol_camille_top_guide.pdfIn PDF document text
    • http://profyhouse.ru/diary_of_a_wimpy_kid_cast_2021r8f9h.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/XghfmBg/ginikokogufofisanopazor.pdfIn PDF document text
    • http://mavito.online/148799338765axoq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 5220 bytes
SHA-256: 4d80bb69593750ff1f45f2dc3ad68d69ff2fcca6f2049542fea3b4bb14ae4b79
font_01_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 11272 bytes
SHA-256: 78d7e1c2ce80cc8e28cf2f6f1c4502edb9e7f880bd77cea2bd2d36f730ecb2e2