Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2102ac7b783b5e…

MALICIOUS

PDF

72.6 KB Created: 2021-05-05 12:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d0137b8a5b767dd33ebfd43f95cee6b4 SHA-1: 30b75327815cf419b9f139a3ca292aa8ab1dd883 SHA-256: 0c2102ac7b783b5ec1882a5b512b7e52f111cdc0da81ff7366651bf03281bca2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of an SEO spam or phishing campaign. The primary URL, 'https://xajibur.ru/strik?utm_term=ionic+and+covalent+bonds+worksheet+coloring+answers', suggests a lure related to educational content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=ionic+and+covalent+bonds+worksheet+coloring+answers PDF link annotation
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/1678013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_60629041c1b71.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/2e0961cd7.pdfIn PDF document text
    • http://vafutixon.22web.org/smiologie_appareil_respiratoire.pdfIn PDF document text
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/68079055199c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fd37f5316b84.pdfIn PDF document text
    • https://jugomezaxazodo.weebly.com/uploads/1/3/5/9/135994004/7f8ef78001d.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/wevaxesajo_xidetan_wijinikesusur.pdfIn PDF document text
    • http://pevokepavaxe.iblogger.org/how_to_video_from_linkedin_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/fu33le8/rumizenis.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/sezulat.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/67738423789.pdfIn PDF document text
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/vegaponavoxukena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fde06c97bdbd.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/89491894569.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/how_to_connect_google_assistant_to_bose_headphones.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/dT8fJhb/livonexag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_602d3d6ab03ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_603a48d2cc180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijularof.epizy.com/97443229932.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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 5496 bytes
SHA-256: 863dee3811ff5390444390341a226cd661fd47d5e1b931b0aac80f135ccc9b0a
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10696 bytes
SHA-256: b658631e34c24c8a4e3ef8e662d9bd1ae7a3a382d53eb5f48d831b55d7e8f8c4