Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bd208c9fdea260…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 07:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e2b60b09ae428c75d7a437851420fa3b SHA-1: 5dee8454b07dc9b841d26ebecc1c4f86267b3270 SHA-256: f8bd208c9fdea260bc04e31c1c612f843f31be10f14fc7c070b50be0c98e3341
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=morfologi+ascaridia+galli+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fd165138e361.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/da57e49637e70.pdfIn PDF document text
    • http://creditactive.info/zumegauq5r.pdfIn PDF document text
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/befebefop.pdfIn PDF document text
    • https://tifidanubaliso.weebly.com/uploads/1/3/2/7/132740836/didulevedat.pdfIn PDF document text
    • http://confirmationhelpcenter.com/542951136779xe5t.pdfIn PDF document text
    • http://woodlesenka.ru/kenmore_elite_black_stainless_over_the_range_microwaveu3lkq.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/prayer_for_all_souls_day_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_601cecbf6b5fe.pdfIn PDF document text
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/gereruxopedol_vopugafav_kevejozoganaj.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/6af04d2c88024.pdfIn PDF document text
    • http://beststudent.space/house_of_lies_download0b2dr.pdfIn PDF document text
    • https://mozabedo.weebly.com/uploads/1/3/5/3/135323929/4654197.pdfIn PDF document text
    • http://bupetud.xyz/bass_fishing_rod_and_reel_guide8ctaf.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/traitor_titan_legion_colour_schemes.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/9575726ece.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/zigubitegebikote.pdfIn PDF document text
    • https://vamubediva.weebly.com/uploads/1/3/4/9/134901044/zakokum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa561540-e38a-4f09-95c8-60cbcda91b1a/element_roku_tv_issues.pdfIn PDF document text
    • http://pekowob.onlinewebshop.net/guia_de_rosario_catolico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c70260e-daa6-406e-bb06-0f19e44ac5aa/can_google_home_play_music_on_my_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460dd5b0-5b2e-4a68-b256-7eac279ea0b4/61222187055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213e381f-dc56-4187-aa44-77612df5cd3c/finepuvuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b32d67e-bfce-489b-a1cf-966b0149c2ce/gogikanub.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_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 5328 bytes
SHA-256: 9856bde8f3da82484d230626288452bd3f2dac36c46c0db5eaa955d265c55e63
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 11280 bytes
SHA-256: 1ca5621043f3725b86749dbe22100c362425dea394dae9132fa42d221814e856