Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a99d56c6c86d4a0…

MALICIOUS

PDF

69.2 KB Created: 2021-02-24 12:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c91cd0a2d6360d5d7d3d0e6c07b015b9 SHA-1: 54f5cf461184b88a01c99f2423e7a7cba9582496 SHA-256: 2a99d56c6c86d4a0d7e001bde747b16eec47c868d20feb575a87b963d8aa0e12
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru' which is flagged as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting malicious intent. ClamAV detection further confirms the malicious nature of the file, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL usage strongly suggest a phishing or malware delivery 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://maypoin.ru/strik?utm_term=roland+td4+drum+kit+price PDF link annotation
    • http://avit0.cc/16192590163mv8ms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_602d473665961.pdfIn PDF document text
    • http://fitit.space/4278254966t7kou.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_6013e6396e529.pdfIn PDF document text
    • http://vash-fasad.live/classroom_behavior_management_plan_template0oxya.pdfIn PDF document text
    • https://bowemubunewoseg.weebly.com/uploads/1/3/0/7/130739536/3119333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_60241ceb1a06a.pdfIn PDF document text
    • https://vujilesozigo.weebly.com/uploads/1/3/4/0/134042384/a7800d9.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/3515190.pdfIn PDF document text
    • http://acgmgroup.ru/78959129094epfjf.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/bevutoluvav_webuxog_rineba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_601de7b81c586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5fc6f152d6f96.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/kozibowisenatu/twilight_saga_2012_full_movie_in_hindi_download_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/71955846910.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/lost_passport_form_post_office.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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5200 bytes
SHA-256: 02244151f46167cb8bee090b00ebc03f8fe620e42b5898c8f244c993adcff42c
font_01_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 10556 bytes
SHA-256: 4c2f5b4fc4efe617ca64600ac6813aedce896a71a33d71c65642fe6c604511ee

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