Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcc177571c0c649…

MALICIOUS

PDF

74.3 KB Created: 2021-04-19 02:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 122f6117493c8f88a057650de6c74a3e SHA-1: 28c3574a0c64fe9d2ae4f9b0c5475a61bad53239 SHA-256: 3bcc177571c0c6497ee019e27e65d3b9282c8654fdffe84525bdf5e8b2696b55
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of link farm or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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://lozipotod.ru/strik?utm_term=ms+word+online+mock+test PDF link annotation
    • https://cdn.sqhk.co/tusujoxaseru/cicjije/19193362802.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/jfjbCjf/13312054031.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/how_to_stop_paying_afge_union_dueszyowd.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/aOhe1ih/neon_light_wallpaper_for_mobile_phones.pdfIn PDF document text
    • http://copyrighthelpptteam.com/public_relations_degreeajche.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/create_a_page_template_in_confluence.pdfIn PDF document text
    • https://kuduvoga.weebly.com/uploads/1/3/4/7/134745106/vusazubunuw-jekulujal-rexefifok.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/JpgghaT/70857710712.pdfIn PDF document text
    • http://tegogigagozij.iblogger.org/15440756105.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/ieyifij/medugabilakawiselulil.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/hjjhVib/permainan_zombie_tsunami_gameplay.pdfIn PDF document text
    • https://fudiditinip.weebly.com/uploads/1/3/1/4/131453724/moziz_fodokosabinigeg.pdfIn PDF document text
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/jorozadoletezo.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/apKsJbM/nefujugotetafatulaxali.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/i1gd6pw/universe_silver_number.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/74379836531sqpfk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/relative_clauses_worksheet_grade_5.pdfIn PDF document text
    • http://tasokapivodi.epizy.com/sexajamigejuzisajet.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/66052033100.pdfIn PDF document text
    • http://ruxopagotar.epizy.com/exponents_properties_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/renowasovakaruvapuwabu.pdfIn PDF document text
    • http://luloxefisamo.rf.gd/allen_minor_test_papers_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/yowhatsapp_app_apkpure.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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 5036 bytes
SHA-256: bb3b7b4025e92c9d406be7b3d825a0086850570e98f55cdafbde35a28aca39fc
font_01_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 10748 bytes
SHA-256: f86dba5a143c74c4b7dba74745b741fe93cebe662f9763d346171fafca41dd0b

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