Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b1d50eced6a825…

MALICIOUS

PDF

72.0 KB Created: 2021-04-21 10:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c6aeb480efc9ed64092648cdbb7f288e SHA-1: 4ba3ea00396b9511c56e1c385dd69b460e53ef20 SHA-256: 91b1d50eced6a82567225a2ac30829b0ccbf3aa943a25c6a91ca0d2124d4ade8
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://lozipotod.ru/strik?utm_term=freelance+graphic+design+jobs+nyc, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=freelance+graphic+design+jobs+nyc PDF link annotation
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/rafedik.pdfIn PDF document text
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/jakupi.pdfIn PDF document text
    • https://sozulidalipidin.weebly.com/uploads/1/3/1/4/131437061/rilujeman.pdfIn PDF document text
    • http://tibijuwubato.iblogger.org/bosch_dishwasher_junction_box_recall.pdfIn PDF document text
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/jumijazitilulubibi.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/E9hgSEv/pedotaxufoxifuxufik.pdfIn PDF document text
    • https://jaxemojemilela.weebly.com/uploads/1/3/4/6/134622921/tadaw.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/hzaijdH/regal_cinema_movies_medina.pdfIn PDF document text
    • https://sapofekotor.weebly.com/uploads/1/3/1/6/131637774/danimifinafaleb_gokek_namunamevosewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_40a75491867e4fc09898ec53d8f59e57.pdf?index=trueIn PDF document text
    • http://jibujopebobusa.rf.gd/belem_portugal_tourist_information.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_93a6ae85dde6456c8502c294c79abe26.pdf?index=trueIn PDF document text
    • http://konenaku.rf.gd/croup_treatment_guidelines_aap.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_cf207ba6eff24209b66d7d8d93be21ba.pdf?index=trueIn PDF document text
    • http://jiwunix.epizy.com/98837791909.pdfIn PDF document text
    • http://bejopirobi.epizy.com/makuk.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 5608 bytes
SHA-256: e9ec1dddcacd311415db547c6412694344c658e981f8fbc7c539b6b0dbe0ec93
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 10180 bytes
SHA-256: 685bff3ae8e22240a813d7a6b38a796d79ddc03b2549855168b2a66f15cf58ca

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