Malicious PDF — malware analysis report

Static analysis result for SHA-256 619470f130136d8a…

MALICIOUS

PDF

80.7 KB Created: 2021-04-04 20:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bbee812bbd90d62a25f88bb48f42e6d1 SHA-1: 578eb594f71d9a5ca6a0efdbe129c3a1dac951e9 SHA-256: 619470f130136d8ac00db7d29f71231a794b00b1e0b5817553e96ff08b812ad4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/award?keyword=bernardo+stamateas+libros+pdf+emociones+toxicas PDF link annotation
    • http://rolapisi.scienceontheweb.net/mewoditagizijasugadoritik.pdfIn PDF document text
    • http://nojigopagapusu.mygamesonline.org/zapawude.pdfIn PDF document text
    • http://botefin.medianewsonline.com/riesgo_biologico_en_enfermeria.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/povizedove.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/will_power_book_2_ghost_have_a_season_2.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/bulajuridobesuxanid.pdfIn PDF document text
    • http://sugakibabusu.scienceontheweb.net/isaiah_berlin_s_four_essays_on_liberty.pdfIn PDF document text
    • http://kesenirevapovid.iblogger.org/boats_and_streams_aptitude_questions.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/jovodepadularaw.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/31110739792.pdfIn PDF document text
    • https://nojiwikimina.weebly.com/uploads/1/3/5/3/135315372/3732102.pdfIn PDF document text
    • http://lopamusagolo.iblogger.org/isley_brothers_busted_mp4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_381c641b39b2446c88a4d63ad1f794af.pdf?index=trueIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/what_does_it_mean_to_be_a_scheduled_person.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_f1e4eac9de1a4e4eb8e44240518d2811.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_7b5fc5c34fa846c7b5504ffd82390850.pdf?index=trueIn PDF document text
    • http://koxolavomuzo.myartsonline.com/joroseramuparejodagaku.pdfIn PDF document text
    • http://tewapodu.rf.gd/zuvujososixujun.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/best_shows_like_sharp_objects.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/99582739043.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_de7b094ea73144e49d74fe329435a174.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_413efaab1b7b4fe5a5a20c2523cf698e.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_5ae213fa032545568e87991d1b4a76b3.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_73f2f38499a04b0fae169de3941242a0.pdf?index=trueIn 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_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 5556 bytes
SHA-256: 28f7d7f229b518ff032bdcca4f848f8e2523b922c76254389831ad73c18e192f
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 11468 bytes
SHA-256: 0ef56ffb789e87136b358d0d720d76b311cf31b0deb9d7f16d81d0e036dd16cf