Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdf68243b2d024f…

MALICIOUS

PDF

76.1 KB Created: 2021-03-07 10:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e7fa25c8867860c985df558e8be7380f SHA-1: 9ba721720e0cb9e3ad1cc2bade182c846a539e9c SHA-256: 5fdf68243b2d024fdf3db7e86be418c5646789c9faf0345cd371b9b5580b17aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm intended to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baarspo.ru/123?utm_term=triangle+inequality+theorem+worksheet+with+answers+pdf PDF link annotation
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/gisaxujedabeb-jibewefer-tevematedufejaf.pdfIn PDF document text
    • https://vijekufimukij.weebly.com/uploads/1/3/0/9/130969895/2104225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383561/normal_5fe5b32558c20.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/3138794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fee80c9d6d49.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/wipiposisuz.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/d0104494dbbf.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/gebabilezipit_bavixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5feda1d556eed.pdfIn PDF document text
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/7c0ad5e9e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ff2a3b8bd797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_60103d5eca170.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/8684120.pdfIn PDF document text
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/guzeleziwav_sexokosegu_ledazodobu_wedatexeritege.pdfIn PDF document text
    • https://jaguzepababiz.weebly.com/uploads/1/3/4/4/134493377/108ef87976bb1.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/wukara/ziminuvalewitenodoxujo.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_e6243965cece4e89bd8aa1acfefa9b7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxapoz/baahubali_2_telugu_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/14533115697.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_c7d61da203644a8f9f4a4f1ecc5823ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7835b3e1-23ce-4917-b31a-bc9c9036c7fe/how_to_set_alarm_on_armitron_sport_watch.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_91aede7d445e42b9b25b6d4c9c64e81d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zugutixe/vefetipali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25abf612-8f6c-47dd-829a-021be4e955d4/how_to_study_medications_for_nclex.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/samsung_ductless_mini_split_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d30104-9876-4139-bb5e-3042b643fb59/75879267990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5a6d91-0fef-4d50-a0a5-dfb0e39d4ede/xisatesejopilorikujuwupa.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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 5788 bytes
SHA-256: 3b17517cbd48f1713e32bd5c2bf433527784b87bc5a5a673b23988c530432ce9
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 11784 bytes
SHA-256: 71305dde5b3ecdffc01635b01134fe2efc585f9d875d368c9a2fe922a8f4b4b7

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