Malicious PDF — malware analysis report

Static analysis result for SHA-256 184167fbf161bb21…

MALICIOUS

PDF

72.5 KB Created: 2021-02-19 17:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5c6bc4bbff03c990db8abf84f99fd872 SHA-1: 2820d2ab722540faba29c7650d40f92c2697c8cb SHA-256: 184167fbf161bb21fa18d1df3fc18f11b628fea803aabb47ff5d8eff875d1ffa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=how+long+for+rug+to+dry+after+cleaning PDF link annotation
    • http://3gusevshop.space/information_meaning_in_assamesefnsi3.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/0878e564c5b94e.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/7527014.pdfIn PDF document text
    • http://birjand.design/tomanitojotoxuma289o.pdfIn PDF document text
    • https://tusogakesi.weebly.com/uploads/1/3/4/6/134661960/bodefekera-vutisesefune-pilibipuj-fubizubapigo.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/lanesosen.pdfIn PDF document text
    • http://diwokaxojizo.iblogger.org/12110047655.pdfIn PDF document text
    • http://geosen.net/appendix_16_form_of_transfer_certificate342sz.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/733680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sirovorisolilu.rf.gd/tataxitowubabepoj.pdfIn PDF document text
    • http://sokozujetabil.rf.gd/48199907528.pdfIn PDF document text
    • http://gapitufukiwiti.epizy.com/51868273616.pdfIn PDF document text
    • http://bufarudewigufeb.rf.gd/fewovuzudozugi.pdfIn PDF document text
    • http://rawarawoxegig.epizy.com/facility_report_o_que.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/schengen_visa_application_form_south_africa.pdfIn PDF document text
    • http://ribibepope.epizy.com/lefupirunerone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 5048 bytes
SHA-256: 5df80039ee5137405a7c77bf58592ff2cfdfc5adfe325bcee4d051850754b79c
font_01_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 10060 bytes
SHA-256: ba74878865277f8fc5d6475bbfe22968d7119453be8a849e2dbd0b4b6c219a3f
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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