Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa9cc0d706cefa2…

MALICIOUS

PDF

93.6 KB Created: 2021-03-18 13:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b69822885acde43a32abac6db5634cac SHA-1: da76572731a02039431e818c48da1fb1e46a6022 SHA-256: aaa9cc0d706cefa285401a7988f7a6611898e98f0ba2df1ccab9877842d9d8fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains multiple embedded URLs, including one that appears to be a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate report.

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 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://jottigo.ru/123?utm_term=frost+and+sullivan+security+report PDF link annotation
    • http://idealslimitaly-ufficiale.site/12243149544r0iqy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_60441360c15d6.pdfIn PDF document text
    • https://cdn.sqhk.co/ninuxoti/5hj5iiz/residual_formula_calculator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fc5a9d2bd296.pdfIn PDF document text
    • https://cdn.sqhk.co/masezupusi/Bhijdje/warowan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_604368fe9fb5b.pdfIn PDF document text
    • https://cdn.sqhk.co/lidumezuvir/hajcyBW/cheat_street_wars_pvp.pdfIn PDF document text
    • https://cdn.sqhk.co/ponigubik/iiRPgdU/monster_energy_supercross_game_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/JoPP3jg/44672219852.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/7icIYhg/11307364085.pdfIn PDF document text
    • http://tugrull.com/how_to_choose_the_end_behavior_of_a_polynomial_functiongtao5.pdfIn PDF document text
    • http://pagebake.com/368764240239a1k5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c7aedd-f099-4753-a8f3-9d9ac41585ae/46928102362.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/mp4_video_cutter_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/46019451970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5225701-b705-4354-8583-6ff98715d8dd/sounds_true_radical_forgiveness_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/casio_g-shock_ga100l-2a.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_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 5184 bytes
SHA-256: 625a8e08181079f8fb7d78f54e0e68641e34de678b2ccee59b70b263c111ac0a
font_01_sfnt_off00013db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB7 12352 bytes
SHA-256: 5c7e266003668ed485eead63c17f54ff86e71e6151fad2686aa860ec11362f35

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