Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f508257e415bcbd…

MALICIOUS

PDF

74.0 KB Created: 2021-04-02 00:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 004a835f572a7c3041476543121fb2db SHA-1: 20784ce90d89e016d584f7fd1ca42f0ff94a7dae SHA-256: 0f508257e415bcbd548a80ed6f2aefd80784e9fbb8b3f914000d40e664ec8658
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 0.9993

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://bologen.ru/wix?keyword=apk+madden+mobile+21 PDF link annotation
    • https://cdn.sqhk.co/vilubofi/EjgNhjs/les_dents_de_lait_du_chien.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ajajhwb/jazz_super_duper_offer_weekly_250.pdfIn PDF document text
    • http://grenkasalo4.xyz/doneduxabobazwfdtr.pdfIn PDF document text
    • http://dubiniba.iblogger.org/69723394750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_6008f886ad4d3.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/h8xigxg/cheap_international_call.pdfIn PDF document text
    • http://vobopagiz.iblogger.org/complete_blood_count_normal_ranges.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/beggvii/wrestling_revolution_2d_mod_wwe_2k18.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/agcihhe/sebulabetodu.pdfIn PDF document text
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/1632732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_60004cbf5f731.pdfIn PDF document text
    • http://sait-ok.ru/2495252120hs44i.pdfIn PDF document text
    • https://jolosusopafo.weebly.com/uploads/1/3/4/0/134097145/sazatu-puxovuvivovix.pdfIn PDF document text
    • https://miteviwu.weebly.com/uploads/1/3/6/0/136006965/7848177.pdfIn PDF document text
    • http://instapriz.site/adobe_illustrator_cs6_tutorial_classroom_in_a_bookqgbji.pdfIn PDF document text
    • http://allfreebets.ru/709045153211x2x7.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/27742032916.pdfIn PDF document text
    • http://webmastervlad.ru/wijoduninoduwoxivifpx4lh.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/damofavikabopedetoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_6029045770d53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petedog.rf.gd/how_to_pair_my_onn_bluetooth_headphones.pdfIn PDF document text
    • http://xubedoper.epizy.com/17244115227.pdfIn PDF document text
    • http://biwufedizew.rf.gd/77481581463.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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 5208 bytes
SHA-256: 550335a3e3b6bea061d321c73a7f4b255e2177f90213b3aa7d9ee13b9fb233d0
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 10868 bytes
SHA-256: 1800b2f8e4e6925e86d9260399c6be87e8780a849f26855c478d69e6ce621038