Malicious PDF — malware analysis report

Static analysis result for SHA-256 2201c12a94b3af09…

MALICIOUS

PDF

111.6 KB Created: 2021-03-22 11:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1ba3cac8e1db8e7b7fdd362ddf1b5e9b SHA-1: a0e4e143c75f77698ff0d28513a16688b8f0e14b SHA-256: 2201c12a94b3af09228bcb13aa7764bee9dde5e3afcbdf2de7be26e08fef9b3b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing or redirection attack.

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://zajinet.ru/strik?utm_term=how+to+connect+sony+mdr-xb950bt PDF link annotation
    • https://dasufurejer.weebly.com/uploads/1/3/0/9/130969026/bakasuwuv_dobataka.pdfIn PDF document text
    • http://fastpeysistem.online/how_does_the_government_policies_affect_entrepreneursqfjxj.pdfIn PDF document text
    • http://milano-moda.space/tamil_movies_2018_isaimini._com1akvp.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/wovafi.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/ac1b659a2fff3b.pdfIn PDF document text
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/pagikoz.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/4998952.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/vuraradaso/letter_h_worksheets_preschool.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_54f80e1f14ff4b9f9e50ab9459b4affd.pdf?index=trueIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_534cc3c993d34666ba7746bf1d28f087.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_977b6ba776184e2389e2ddf5c038e589.pdf?index=trueIn PDF document text
    • http://tugupora.epizy.com/bogazomaritijujirir.pdfIn PDF document text
    • http://pevudavef.rf.gd/zanoxaru.pdfIn PDF document text
    • http://jutekezas.rf.gd/2016_form_1040x_mailing_address.pdfIn PDF document text
    • http://piluwut.epizy.com/darjeeling_tourist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/amazon_affiliate_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/how_to_fix_error_b200_for_canon_pixma_mp560.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_897bf945304e4a8eac9b8208477fb19a.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_243863ccfc9d43419c1fdf69053d3d82.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_8abe992cdd9542ef8fb0a8843f1953ee.pdf?index=trueIn 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_off00017535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17535 5660 bytes
SHA-256: df21b38ac1ae9fea12f36bff98eb049ca8222e936cf8bf11606dbde2f948c1c1
font_01_sfnt_off00018882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18882 11824 bytes
SHA-256: cb37797c744039a2529bdbde788c5d289cb4bcc13f1d05907f9ef485070c8ab8

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