Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7d2a50942235eb…

MALICIOUS

PDF

74.2 KB Created: 2021-03-06 18:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0474cf97658ac9a87b14cebf808ec66a SHA-1: b148cfb72b8fac031a9f2abe2584c6a155308821 SHA-256: 5a7d2a50942235eb97d7d9d4e25171cc0e30bfca153e91026650ce863c68b26f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, pointing to phishing or malware distribution. The embedded URLs, such as 'https://dugedepap.ru/strik?utm_term=sq11+full+hd+mini+dv+instructions' and 'http://graatorama.fun/fefisalesunuljjeqd.pdf', are likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL heuristics strongly suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=sq11+full+hd+mini+dv+instructions PDF link annotation
    • http://graatorama.fun/fefisalesunuljjeqd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5ffe985236409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_603271616ca77.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/5622879.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/763304.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/kikojubuzorejizisop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_603329b980ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_603a3ea9b37be.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/kigonamaraledametiwa.pdfIn PDF document text
    • http://roman-holidays.shop/3356630090szgkj.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/mubepi-samadopidoz-lujugoli-rikojugakaza.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/20911344037.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/vovivikigelumobere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_6017258900437.pdfIn PDF document text
    • https://lupemofuxuxutuj.weebly.com/uploads/1/3/1/3/131383332/sabafebunonu_lininaru.pdfIn PDF document text
    • http://probkin34.xyz/11149970206feoxy.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/b5240b57-5abf-44fe-b3ce-be8c344ec71b/why_is_my_paint_gun_splattering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db418a8f-9bfa-430a-a701-6d7b29409500/define_curriculum_mapping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46666d55-a882-4c92-ab77-bfc560086b85/47504395781.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_f723e5fa3b0044adb42378d3571d1b27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd1c3ed-bb5f-4231-ad5a-6b464742fa81/poulan_2150_chainsaw_parts_list.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_74291d53a4974227aa50049aa88d4bed.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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 5392 bytes
SHA-256: f1e9cd33dc0d8aec2d7f1fc390ec400ae7b303f7d7f368d29935c608de0c05bd
font_01_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 11036 bytes
SHA-256: d48943ee379076712192523e7b46af45a7f9b83f4eb22964d42024987934037d