Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e32179d3dab1db…

MALICIOUS

PDF

82.1 KB Created: 2021-03-06 02:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32b7b9dfb989e4b89d3d3bf63145fbf8 SHA-1: 99cb4dfba7d708d431fb0af4e29b7a817207a35f SHA-256: b7e32179d3dab1db41710ee393da129b7b4c93a5ce3c200d5c90b1b538bc81a6
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 0.9995

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://xezojetit.ru/123?utm_term=kubota+v1505+parts+catalog PDF link annotation
    • https://kijiwutexaji.weebly.com/uploads/1/3/4/6/134698992/vikixazu.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/Ghgohe6/23334498310.pdfIn PDF document text
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/5758e22ad.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/gfud0yf/53801578404.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/1662280.pdfIn PDF document text
    • https://zufefofavenubu.weebly.com/uploads/1/3/0/7/130775539/sakawi.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/8d3aea0.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/how_to_get_rid_of_red_acne_spots_on_face_fast.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/53331289115.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/rarefasatabezul.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/tizititese_jibuzolubujefex_kopigerexi.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/f8zpC0x/facebook_search_by_phone_number_2019.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/dish_network_sat_129_channels.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b2653081-35ac-4e59-9a40-36b8e83e2c33/mechatronics_sixth_edition_electronic_control_systems_in_mechanical_and_electrical_engineering.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/red_a_crayons_story_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3faae6-4a51-4101-8fac-236a408f3a0e/gojogemujod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d624ce-d562-452d-a519-4b0ef7741246/collins_the_language_of_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cf8b6c-4dce-478d-b397-c0c5afd0de11/the_zookeepers_wife_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc61074-6f8f-4495-81f1-a3ead43c3daf/lesaxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a87a16-5a4b-4d87-be41-16571ca33a49/mob_grinder_schematic_minecraft.pdfIn PDF document text
    • http://jujobope.atwebpages.com/47752291429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd53fc4e-66f5-4421-acac-1dbf61f5805a/joker_murray_dialogue_script.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 5200 bytes
SHA-256: b8c2dbaf101216dc0525fab554fc78eb2c57bbe67bf032aa4bc5c5d62d7afec0
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10112 bytes
SHA-256: 923ea539bc3e299aa63951f058a678ea9c03716e5fa1b184e59d5abf2033b08f
font_02_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3