Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd834c207733802c…

MALICIOUS

PDF

93.5 KB Created: 2021-06-06 03:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6626c2a63503438c3db5482128ce8c0c SHA-1: e0aaf85c2bd7f70157f00f516effb3ed7452af5d SHA-256: fd834c207733802cafeb65dc87949c3756cb27436f23cb654da3de514e9aef4b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document attempting to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/123?utm_term=amoxicillin+clavulanic+acid+dosage+forms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480750/normal_5fcb3315d659f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5fda32cec826c.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/tugurefaze.pdfIn PDF document text
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/307237.pdfIn PDF document text
    • https://tifuvanolini.weebly.com/uploads/1/3/4/7/134703883/parafufes-sunopigijojege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_6010cdf2ea271.pdfIn PDF document text
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/zuweruloxenawiw.pdfIn PDF document text
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/754779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_60512a55eb9f8.pdfIn PDF document text
    • https://lutaxabivuk.weebly.com/uploads/1/3/0/7/130740512/4808828.pdfIn PDF document text
    • https://zuxolizaf.weebly.com/uploads/1/3/2/7/132740519/8441583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423078/ruwiwo.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426117/14097614846.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144691254/24901148346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e05fd6-686d-4c74-8c05-8a693cfa8275/bebabogebegezuv.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144665280/tajixopivede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28124582-0b25-4cef-99fb-cdfeae4a6df5/biserelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ffdddb-c456-4a8b-8611-b5f1341a5a26/73514627965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c152de8-52d5-49b4-9e4f-922016e2197b/fce_essay_writing_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e9c601-039b-4b42-9376-585c856af1b3/chuck_palahniuk_guts_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9138e584-5eb3-4484-b710-fcd5483dae4a/98822506600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5171802a-61df-4e23-a366-93f06499f157/how_do_i_cancel_my_washington_post_subscription.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144547236/67145800138.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 5456 bytes
SHA-256: d67f4d069e2890b784a6bb06cddab8ec6345b5ad0376dba093a15e821f67ba69
font_01_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 8132 bytes
SHA-256: b10a2d1e6bfc6f69cef7e6b4e5bc87bf7375645924b86856799391bad65afcd7
font_02_sfnt_off00013ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF5 12788 bytes
SHA-256: 78a54953b674f22d3879f82c3ab5c8d27e602d0cc6dbf18c90e13c6cb81bf6a2

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