Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d396816a3cdc693…

MALICIOUS

PDF

80.2 KB Created: 2021-04-27 08:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf1e7a060c567122520a36f2a5655de3 SHA-1: 274e7b32757eefde42fc7f5b657ed8f8a62efda2 SHA-256: 7d396816a3cdc6934afd43d4f67e50031e83b16f6ecbdc5f66ee0e01930f40f8
226 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable hosting and suspicious domains, indicating a link farm or phishing lure. The presence of invisible links and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://maypoin.ru/strik?utm_term=navy+e-5+eval+due+date PDF link annotation
    • https://cdn.sqhk.co/lojibuwe/hPijggk/nuwod.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/5gfvOgh/bufemogaremosog.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/ggfPA8B/stickman_and_gun_3_zombie_shooter_hack.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/3a511aa5264e.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/heiejat/resident_evil_8_ps4_release_date.pdfIn PDF document text
    • http://wtia.space/fepozijo8yk8z.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/cjcghgi/71020697171.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/jhsHigI/medusexonosi.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/sakakukufokubavafe.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/haGgeow/zuliduxijiselipufom.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/Ziggqgi/login_to_indeed_job_search.pdfIn PDF document text
    • http://ru-payment.casa/52121599971g6bux.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/FhfEIhd/rizepikanaxedisofo.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/toxevekagupewepom.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/gT8KghR/vitavenisidudejuseduja.pdfIn PDF document text
    • https://cdn.sqhk.co/muditazu/giMSia0/project_break_even_point.pdfIn PDF document text
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/3960167.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/g5gfeXB/warcraft_gameplay_2020.pdfIn PDF document text
    • http://lnstagram-support.live/dc_dutta_obstetrics_9th_edition_google_drivedc5d5.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/kDjaZM7/kalula.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/QjajdrZ/batolopujejukalariw.pdfIn PDF document text
    • http://wdd13.ru/10574656612o8k8d.pdfIn PDF document text
    • http://20970907.net/probability_worksheet_2_answer_keyfyc5w.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/ijOXhbx/pinout_for_straight_through_ethernet_cable.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/jbhjc1f/kiko_milano_lip_gloss.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/2349223.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/gBehihf/zififolumesorotalanusinin.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_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 4832 bytes
SHA-256: ea1604ef6a815ea9279aaf3134421cdbf57dcfb66071d32cb8629d718a4bd0c8
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 11992 bytes
SHA-256: 97895c9201f28c5e4eb46852a319e0e514f5cb841f07fd660e9744eb26b11a1e