Malicious PDF — malware analysis report

Static analysis result for SHA-256 917b1bf394d70852…

MALICIOUS

PDF

78.1 KB Created: 2021-02-22 19:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fd22de2b965ed24771a74d8089f4f4bb SHA-1: 1d73f5a0be8d1e5fcd949457b879111b07886aa0 SHA-256: 917b1bf394d708522855af913b37f4bde5aca2c485fc9fd7120eed3d4316dbfe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with SEO-friendly slugs, suggesting a link farm or SEO manipulation tactic. 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 links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=bakery+story+2+cookbook PDF link annotation
    • https://cdn.sqhk.co/dixufeja/ujePUvM/ocean_is_home_island_survival_cheats_unlimited.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/oHSVvgj/dubofapixurepofewum.pdfIn PDF document text
    • http://whitecheat.xyz/tamasha_movie_video_song_mp4kq8eu.pdfIn PDF document text
    • http://carishr.com/41876401455d2gww.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/g9fDXha/1010_colorado_st._austin_tx.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/nonutufodesoja_vanebebezevamu_wunok_sijeder.pdfIn PDF document text
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/soladodekewuzudur.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/auieMgc/34011643589.pdfIn PDF document text
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/3724a19e44e476.pdfIn PDF document text
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/4646857.pdfIn PDF document text
    • http://probnik1313.tech/cdr_king_wifi_dongle_driver4pscy.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/bubebadox.pdfIn PDF document text
    • http://mif-smeh.space/xujamuwewigke3x.pdfIn PDF document text
    • https://muzuwetabez.weebly.com/uploads/1/3/1/4/131483468/4c5a038.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/tokit/39968807227.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/how_to_put_sim_in_doro_6520.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/52607253623.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/41855628724.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/32443498803.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/why_is_sap_so_difficult_to_use.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/vpn_proxy_master_for_pc_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/koxaki.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/5543014657.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 5248 bytes
SHA-256: 39e1053d1cffbe35cf5285811a81cf2010f6840b6c4382cc5c3d72645d12b0f1
font_01_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 14104 bytes
SHA-256: d95beb4499f24821485f0e668ee1d3d586b28f9bb6961806d93fcda2396bea37

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