Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c72229d1974930…

MALICIOUS

PDF

70.7 KB Created: 2021-04-02 21:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57eab3c44120374e5079f6457aebfaa0 SHA-1: 11d7c19b4e9e9c0636cb2fa57a48d57d104f8989 SHA-256: a1c72229d197493085205dffced46d6c2091a846cf8d54175bcd935530c6a2c2
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://lozipotod.ru/123?utm_term=conditional+sentences+exercises+with+answers+doc PDF link annotation
    • http://discount50.pro/2748093813788ag6.pdfIn PDF document text
    • http://arevakar-travel.com/wabopamiwunojelasozcg7.pdfIn PDF document text
    • http://fevevafo.medianewsonline.com/38235942274.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/9143411.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/tone_it_up_protein_bar_reviews.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/daddy_poem_sylvia_plath_essay.pdfIn PDF document text
    • https://tegipogelow.weebly.com/uploads/1/3/1/4/131407588/e7ec348acb24af.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/87720967519.pdfIn PDF document text
    • http://jebonefawudo.sportsontheweb.net/39614535603.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/81342103135.pdfIn PDF document text
    • http://civiliscmq.online/rusowagakoxuxizod05zug.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/4209573011.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/bd58d585-d337-4e7c-ac9b-7f7f0bd668d8/viboseboxivipisik.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_3e3cca04cc5a4d57b6cff4f4a61fd02f.pdf?index=trueIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_6c511acb2d89498e8347e185336f9be1.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_6a2a24e7c2d64c4987fec52fc9702706.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd42e9e7-d908-48ef-ac5e-ade9901e5bcc/hoover_pro_pet_carpet_cleaner.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_be9d358d1602422d88cd03bf39724b89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47db1067-eeb1-4871-8f01-d46489e3857c/80586131745.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_f50f3c0bd0094e5091373fae1fdeef84.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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 5092 bytes
SHA-256: 0eb06c3e82fd59350409f25e2affeb6613c75ea3c2bf230a4ff84c199568de41
font_01_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 10352 bytes
SHA-256: 690743f8c37495f9c473b488685e649d15a3abc9d5621fda99b0c4b3d630e5cb

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