Malicious PDF — malware analysis report

Static analysis result for SHA-256 3978d12d0e3a7e0d…

MALICIOUS

PDF

88.5 KB Created: 2021-03-08 22:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 632dd154f36858d8d9f6fbeaccc4a455 SHA-1: a923eb68f4207c67543eae9b125d587bf34b51bd SHA-256: 3978d12d0e3a7e0ddd871f4243dde80dcac428a42b8ad7d038fcbbc76c14c354
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains multiple external links, including a link farm and a redirector pointing to 'https://baarspo.ru/wix?keyword=game+apk+lovers', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, combined with the heuristics, indicates a lure for downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=game+apk+lovers PDF link annotation
    • https://mejofeva.weebly.com/uploads/1/3/2/6/132681501/7225551.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/dlgfUgj/mobile_ringtone_2020_iphone.pdfIn PDF document text
    • https://levazisibeguni.weebly.com/uploads/1/3/1/0/131070530/sadumamosixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498983/normal_5fd3aad31bcf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fffaf356db6d.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/igeO4ih/how_to_make_a_ultimate_chocolate_cake_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/egfdjae/super_hexagon_apk_mod.pdfIn PDF document text
    • https://wakejowedab.weebly.com/uploads/1/3/4/5/134599651/fovomilatadup_rixaz_kawopowuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409628/normal_5ff989044dee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_603bd7fcd18bc.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/bngNsoh/39382547226.pdfIn PDF document text
    • https://cdn.sqhk.co/gawarebadal/8Eii7jf/xusigavejitepisavuxujo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fec35885c581.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/gigjgeL/black_label_innovations_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/agdmphc/14712936504.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/3zkgghb/xedevitotalekijowibuweb.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/he6gj4R/koxitadusazas.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/kefefetafij/hello_neighbor_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/research_paper_acknowledgement_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/52448111492.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/clases_de_canto_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/vivoxevoridumabubufijudo.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/essentials_of_understanding_abnormal_behavior.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/league_championship_series_format.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_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 5120 bytes
SHA-256: 4f507a3d5f0f6b1c17802c8f8bbe9808f2b6d4df182f1ee65afa289b727a2436
font_01_sfnt_off000130c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C9 10684 bytes
SHA-256: ec5b15e903e743d1542b58a27f8a5ab96b0d392de108033d819a5108d753dfd0