Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c71a8a68aa8bf96…

MALICIOUS

PDF

76.7 KB Created: 2021-02-20 23:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0558feee672d68112e13286179835684 SHA-1: 25646df2be450561b6908c398934e7a19bce8ce3 SHA-256: 4c71a8a68aa8bf96ebccada32677ab586544ff2ff621c1a52d7ebcbfab9c26ab
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are hosted on disposable domains or link farms, indicating a likely phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=what+are+the+advantages+of+using+energy+sources In PDF document text
    • https://cdn.sqhk.co/tavedikovo/mGjjjjN/pidawuwerumefege.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/kutegidalizedu.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/I4qhhic/resident_evil_2_movie.pdfIn PDF document text
    • http://zerkalo-fugicar.website/rivewogorijfnuwt.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/MibLjjR/under_seat_storage_silverado_2018.pdfIn PDF document text
    • https://namekabesomi.weebly.com/uploads/1/3/4/6/134668803/0cae4c30dd1.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/rowemolon.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/bogovelikalat.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/4hc0Q9D/51755785049.pdfIn PDF document text
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/litajoninar_rezexuw_pilufabas.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/2377883.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/hi0hekC/banifiselutilos.pdfIn PDF document text
    • http://dragonflysagewellness.com/call_me_by_your_name_2mt22d.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/nizajanepudakid-zubolulapiduva-pijinax-wuzeposinoj.pdfIn PDF document text
    • http://levelupguild.com/29797610915c7i8f.pdfIn PDF document text
    • http://retys.fun/pre_algebra_free_online_courseb28qt.pdfIn PDF document text
    • http://securespot.ru/how_to_change_the_hdmi_input_resolution_for_a_sanyo_tv1czei.pdfIn PDF document text
    • http://kihepc.xyz/bookmark_onedrive_ipad90ru4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugixemavofagen.epizy.com/flight_simulator_game_apk.pdfIn PDF document text
    • http://robexekipojop.rf.gd/microsoft_office_online_calendar_templates.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/bryson_tiller_album_2018_zip.pdfIn PDF document text
    • http://dowupozor.epizy.com/action_research_in_mathematics_education.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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5428 bytes
SHA-256: 400362d671fe0091b77b6843649ed5d3945ec1181d63fd4e971c44139f9b390b
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 10488 bytes
SHA-256: 0e822d967344782b265e7ea88f83c9e25b7b41a9dc534bebca4c8046e0d1bbb6