Malicious PDF — malware analysis report

Static analysis result for SHA-256 6756cdebc5598a70…

MALICIOUS

PDF

73.3 KB Created: 2021-02-12 07:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0c79b453b3eb2c80d64be43f3ab47667 SHA-1: 473a3418d2038ff50cccba9fec36e7e01b43e56f SHA-256: 6756cdebc5598a709f4c6d9fed3093aa2d12415fee714e07876457ee5c90a6eb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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/wb?keyword=appreciation%20words%20to%20employee%20for%20good%20performance PDF link annotation
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/wokamer_savazame_giwusi_nukawezesobugef.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/xogef_nixasi.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/maluzel.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/f8e661b08.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/lubetugisito-zekefu.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/3814bca74602.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/5322448.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/eb88c33060ec.pdfIn PDF document text
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/3457867.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/xuninexuziwodu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foduwisidowej.rf.gd/69436095242.pdfIn PDF document text
    • http://wojodiguf.rf.gd/daily_scrum_meeting_agenda_template.pdfIn PDF document text
    • http://motinekan.epizy.com/alternance_informatique_airbus_toulouse.pdfIn PDF document text
    • http://rexonaboruli.epizy.com/79777616692.pdfIn PDF document text
    • http://dedamedasobime.epizy.com/biomateriales_dentales_cova_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/harry_potter_quizzes_with_answers.pdfIn PDF document text
    • http://buxidogekalor.rf.gd/59476327115.pdfIn PDF document text
    • http://dulubuli.rf.gd/xifetotasetuwi.pdfIn PDF document text
    • http://fevejalamozek.epizy.com/39953322556.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/vonegezukezigerofarenefe.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/faguvemufatetu.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/85448210399.pdfIn PDF document text
    • http://luvewon.epizy.com/asia_political_map_outline.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 5660 bytes
SHA-256: 5807d48d69e277772da0ab84c6dd5d8ae86a1cd7b3b919aeea3674ce0c821dfc
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10308 bytes
SHA-256: 50b0f3734921babd28aac496dea67b645c7099d599ea36e3a136a3f0d0f34eee

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