Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e62700595e95f8…

MALICIOUS

PDF

76.9 KB Created: 2021-02-26 11:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9fff2323dc5811f08235239982c354e3 SHA-1: a70fb156d05528df69414092e75fee27eddc5c99 SHA-256: 18e62700595e95f8584d2c416f68b092ffbb4a73ba93e98b09bf48d890062e9c
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 significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

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://dugedepap.ru/strik?utm_term=6+core+values+of+social+work+explained+uk PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/pexiladopamagegub.pdfIn PDF document text
    • http://loxesitigogu.iblogger.org/zulurabolikoza.pdfIn PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/jirixisuxibufu_fosoriwupe_voxubejan_tiruz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fda1c1e36343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fcf98903e195.pdfIn PDF document text
    • https://gevotasi.weebly.com/uploads/1/3/4/3/134389209/jekevaredir-lofaf-pusalevipi.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/Ygj2dMx/soxusetemelowinu.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/Ughjiia/charm_root_word_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/Y6oUPie/fumubeworomeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd3b63aa5751.pdfIn PDF document text
    • https://jofevuwob.weebly.com/uploads/1/3/4/2/134235005/pinaxobo_bitibafuwijeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/ixjhagg/24703127425.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/xomedomolaruzorasum.pdfIn PDF document text
    • http://wiwikiru.iblogger.org/how_to_empty_eureka_multi_cyclonic_vacuum.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/kagogimebaz-xigemonazi-solobuluwemupo-gilegexot.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/2icjijd/29807603613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivubijorudi.epizy.com/chalk_and_duster_songs_ming.pdfIn PDF document text
    • http://rexawisoza.epizy.com/xujul.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_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 5492 bytes
SHA-256: 8eb5b1abba82b938420e3678f172255a60d870634b26631900ecb6ab4b2c7ebe
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 11808 bytes
SHA-256: 7286c9d5210e7b835cd473a5498aca5c514c86d432e31271e9a7474c897d6e76

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