Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e1e3ef7a376adf…

MALICIOUS

PDF

67.7 KB Created: 2021-02-21 13:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ec3b411a13455d8743e9f7960f0e2871 SHA-1: 286b497861a34a287e892c9aab02650a8431ca68 SHA-256: 99e1e3ef7a376adf50fa824803aa5f2d276372dddd74f9e77f9dbde8b73ea42e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a PDF SEO link farm and external URI usage. The document body, though heavily obfuscated, suggests a lure related to 'basic english grammar pdf'. The presence of numerous external links, including those hosted on `cdn.sqhk.co` and `baarspo.ru`, strongly suggests a phishing or redirection campaign, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=basic+english+grammar+pdf+betty+azar PDF link annotation
    • https://cdn.sqhk.co/papowepu/zjjjgil/69763102870.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/hXflOgd/xakafexukubevafilus.pdfIn PDF document text
    • https://cdn.sqhk.co/pulobegefuzi/jg2UrC1/kexedunokofe.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/eE3kOii/92750289723.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/pumilenukavi_zojusom_gezap_dagibepamo.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/dibgiwQ/66368523151.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/2pISk1K/25873529914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_60228bf257e61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ffe910d60c0d.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/cie3GZ9/rawovovokufun.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/iCTsLge/wukakaxelamomegekezis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_5fdef8dce1e4a.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/tajimipojimo/garapogutunarevinodiwere.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/dell_t7500_motherboard_model.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/checkers_elite_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/ccleaner_64_bits_crackeado.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/best_meme_formats_of_2019.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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 5912 bytes
SHA-256: 54b7675cfcee65f65239eb50ff761091cbf2f4e0272ce041cc4905eac2520471
font_01_sfnt_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 10460 bytes
SHA-256: 8b5f3cd8a0f5bfa4aa600b90eccfe0203a4ef6c2afb861b09e68027995cbc04e

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