Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7305c5f01dafc4…

MALICIOUS

PDF

67.8 KB Created: 2020-12-23 10:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f3ba19605a54510840796b45b1be855 SHA-1: 2b5490d9952e5909535fd767ca40edfaf3a644e8 SHA-256: 9d7305c5f01dafc48e83e12da08eb2fcc7326e858d38e817f77e9837dca77566
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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.
  • 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://trafffe.ru/aws?utm_term=abc+worksheets+for+grade+1 PDF link annotation
    • https://jedozemuko.weebly.com/uploads/1/3/4/5/134596711/cfb7a.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/6726dda5d1.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/fepinuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_5fb5b632b237b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5fa54e1dddab1.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/rojasiwis.pdfIn PDF document text
    • https://pazelofigo.weebly.com/uploads/1/3/4/5/134588761/dakidetoxe_vibujolofeko_sifari.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/6480454.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/buveg-fugiluza-dojitonugaj-goweg.pdfIn PDF document text
    • https://tujonodup.weebly.com/uploads/1/3/4/7/134717107/womiv.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/771b77ce-69f7-4cf6-9385-9a51cc287feb/unblocked_games_potty_racers_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0363b5fb-2724-4bde-84fc-6893af06df08/92062304601.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/video_converter_windows_7.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_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 5588 bytes
SHA-256: f592befef80207f6f378828c300259e07f1cfc8a7f4bc69ef34293530cdfae97
font_01_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 11628 bytes
SHA-256: cc75bb08cb56a9c908f72c82eeb5ba9e9a9a116627f48b035e7e95e11b2138fa

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