Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f51bd8063c8582…

MALICIOUS

PDF

77.3 KB Created: 2021-02-25 12:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: df57bdfeed9611e7be482b3760bed5af SHA-1: 983845a0a2a4f6ee59679d03653470b7cee8a2ee SHA-256: 48f51bd8063c8582f1cc93528d1a6829b239e9520fce99d8b77388fc756ffb5e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://leonvi.ru/aws?utm_term=craftsman+air+compressor+accessory+kit'. The document body, though heavily obfuscated, contains text related to 'Craftsman air compressor accessory kit', suggesting a lure to disguise the malicious intent. The presence of many links and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/aws?utm_term=craftsman+air+compressor+accessory+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491936/normal_600f8f8933967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_5fe02f2809582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fd252ed26d7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fda244a2192d.pdfIn PDF document text
    • http://a1metromovers.com/drug_and_alcohol_course_florida_answers2ryca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5fe278ad38afd.pdfIn PDF document text
    • http://petonopelun.iblogger.org/17209286150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_600e8874a1da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_60112113c3726.pdfIn PDF document text
    • http://tvoyoproc.fun/key_informant_interviews_advantages_and_disadvantagesowebp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_601233e633004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_600a3f6eb412a.pdfIn PDF document text
    • http://vebumugaw.22web.org/what_are_the_environmental_impacts_of_volcanoes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janutepapuzise.rf.gd/dtsc_biennial_report_forms.pdfIn PDF document text
    • http://peforuk.rf.gd/how_to_use_stihl_autocut_c_26-2.pdfIn PDF document text
    • http://lelutipajeb.rf.gd/13679645606.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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 5200 bytes
SHA-256: eaa647eee40f99b3ba5b74919dd0fd803470f57ee28f8b9f077b4febb5d5c4a4
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10564 bytes
SHA-256: 18add54f8439248142eca59ddf89d76884a03d073a889589843647e23518f3b0

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