Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15590dbd344082a…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 15:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b90153e47cc434ac1746003b234b2584 SHA-1: 0039ba941ee6f3565d5a7eb434a7495545eb2381 SHA-256: f15590dbd344082a2e304c9726caf89985dceb780dddaae0a832132b582e4e1d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malicious redirection attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=html+css+js+real+time+editor PDF link annotation
    • http://questotzvezd.space/521236749093a1of.pdfIn PDF document text
    • https://sitotibaw.weebly.com/uploads/1/3/4/7/134752740/mafularurez.pdfIn PDF document text
    • http://pipawopozovifo.iblogger.org/diablo_3_new_season_leveling_guide.pdfIn PDF document text
    • http://housefashion.ru/forifazxni3v.pdfIn PDF document text
    • http://raifaisentapp.online/jajelyjun4.pdfIn PDF document text
    • http://newyearshop.site/kirby_heritage_2_legend_vacuum_cleanerfvrgk.pdfIn PDF document text
    • https://pinuzika.weebly.com/uploads/1/3/4/6/134640149/sinugunew-resejedini-zalawulupibuwo.pdfIn PDF document text
    • http://labincom-med.ru/thickness_of_mild_steel_sheetuqgen.pdfIn PDF document text
    • http://towibukawit.22web.org/chevy_bolt_2017_manual.pdfIn PDF document text
    • http://hhizmet.com/christchurch_earthquake_survival_storiesdke5n.pdfIn PDF document text
    • http://sandwichhq.club/posubinusujafg2e7z.pdfIn PDF document text
    • https://mapavafamaluri.weebly.com/uploads/1/3/5/9/135999294/2398574.pdfIn PDF document text
    • https://durajonuz.weebly.com/uploads/1/3/1/3/131383269/7809097.pdfIn PDF document text
    • http://islemleriniz.org/dd_5.0_players_handbook_downloadxnrrd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_2e0fb3c978104bb3afad1ecb911c7fab.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_92c3a7c9d5f34150a245d6d81b338310.pdf?index=trueIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_15697172c6cc45588519bb2e994ab7e1.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_02d55bf91de0436ba05a3ce8847998f7.pdf?index=trueIn 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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5124 bytes
SHA-256: c078acc7d01075519e3d7eecb865021009cd8838314b8e881d9e98a0c359e574
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 11220 bytes
SHA-256: e726a80dcda315c94851c1f5bbe68ceca08e7e9e90412f73b8feef5dae7e20cc

Open this report in the interactive analyzer, or submit your own file for analysis.