Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d91053abbf3d90e…

MALICIOUS

PDF

77.9 KB Created: 2021-05-13 00:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3853069d90cafef14d62ab6d8088885a SHA-1: 45a3f5368c73b8cd3ae959fe345b0d5ca5f9d348 SHA-256: 9d91053abbf3d90ee9be5774a7b83d758547f9066016cc6c63121c7221e8d6dc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly subdomains, suggesting a link farm or phishing infrastructure. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.999654 strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=ikea+queen+bed+frame+white+wood
    • https://daxigowopijadek.weebly.com/uploads/1/3/0/8/130814785/kipojupolewavepuked.pdf
    • http://nozetexopawovu.iblogger.org/human_virology_collier.pdf
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/wotifunilujiloxi.pdf
    • http://specrazreshenie.com/yamaha_av_receiver_rx-v377_manualmp94n.pdf
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/485e959.pdf
    • https://kizozadasope.weebly.com/uploads/1/3/1/1/131164448/3274415.pdf
    • https://lalevajapogos.weebly.com/uploads/1/3/0/8/130874146/2793000.pdf
    • http://itclick.pro/liste_suffixes_franais0trn4.pdf
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/6350651a.pdf
    • http://italiahot.space/22836261724m43d9.pdf
    • http://expressvpn.store/kubekebuapkv.pdf
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/samufiwesa.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/2018958.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dozuga/jugaj.pdf
    • http://gazadimo.rf.gd/gijimerowezoleb.pdf
    • https://s3.amazonaws.com/limepusotanal/72015581692.pdf
    • https://s3.amazonaws.com/xovekolamoxe/one_page_1_to_500_numbers_chart.pdf
    • https://s3.amazonaws.com/mozirolinitaje/39484692907.pdf
    • https://s3.amazonaws.com/pusori/lg_leon_4g_lte_phone_case.pdf
    • https://s3.amazonaws.com/xidazeze/bundoora_primary_school_uniform.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/pabawepuvidizapijevej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b4.bin
eae10b5bb028eaba6f54a14d5a688f84b3da41ebf2446bb73f9c82f2a91801cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 5296 bytes
font_01_sfnt_off000103a4.bin
f40cff15f639c8f0687fa20790d65c2a7611d9075c5ee63923c02a8f087d4d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 10856 bytes

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