Malicious PDF — malware analysis report

Static analysis result for SHA-256 c539b6aca23312ac…

MALICIOUS

PDF

67.8 KB Created: 2021-01-14 10:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 211913ebebfc9dd6e3bb3754f126a7f3 SHA-1: 0e75a5dddab9cc2bdd38c17a9320bfb5ba26b7b2 SHA-256: c539b6aca23312acda7ba3c74c2b5975c91e55ab11c3b7ec2e9da5d095bf771a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/aws?utm_term=blade+runner+tamil+dubbed+movies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd61178097e7.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/xivizeverodafepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_5fc42d996b1ef.pdfIn PDF document text
    • https://site-1176489.mozfiles.com/files/1176489/splatoon_2_booyah_bomb_level.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/4715011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f895faf2216e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5fd8b6a18312c.pdfIn PDF document text
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/ladiduzugari-tiliwusisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5fee3879c86ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f91f0837241d.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/31440a3c50.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/pravoslavni_kalendar_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/nic_network_interface_card.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c4ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC4AE 8956 bytes
SHA-256: 4be2626e5d3531063742562cc86319392b21d5155fd2dc00538ee7dde76ee16f
font_00_sfnt_off0000b308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308 5220 bytes
SHA-256: a68b88c03873d9eac59420bc14e6aa923615e324379fa7a953afe9d7d1d7baab
font_02_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 10772 bytes
SHA-256: 5d3597a6b016878390725fd74d89a1be0f29e8fdd641686aa6917843bc8c447e

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