Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8be93fd3531eace…

MALICIOUS

PDF

75.6 KB Created: 2021-05-30 16:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2bfc634470b6499c655b6afe5e711655 SHA-1: dc7467541c84549c49d6661829a18d1f87b9658e SHA-256: c8be93fd3531eace1444940fcb1fff7c684f3e35d998015b2be150a9c3bbeba8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the heuristic firings related to PDF link farms point towards an attempt to redirect users to malicious sites, likely for malware distribution or credential harvesting.

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://pelibifir.ru/strik?utm_term=movies+2019+full+movie+hindi+bollywood PDF link annotation
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/f8cb8a6713162cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_6015c020c8c71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fee922454501.pdfIn PDF document text
    • https://wimupivirexov.weebly.com/uploads/1/3/4/9/134901171/vijenapuxetopor-lesugaluguf-jonowejox-kanokazigifuz.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/6580250.pdfIn PDF document text
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/xugirofinapakiriko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_6007b24b1c1ea.pdfIn PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/jabotamej-vapisidudusila-faxokogi-givegaziwipax.pdfIn PDF document text
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/wesazelubedut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fe8d4e123b0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fddc1892696f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_600aad02385b5.pdfIn PDF document text
    • https://jovovanin.weebly.com/uploads/1/3/1/8/131871717/wetapopugadidif.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/121493b0-7a64-4fab-a0d7-711ce16e5c49/71697064796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65279f20-fddd-4886-b2df-ed76e399e282/nyc_court_officer_physical_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfccb54-960d-4c51-ba68-7aa48361328a/45023127360.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 5724 bytes
SHA-256: 447d6c6c6d0c50d16051a93f6b1d949652d7c7574ebc5c0b1f110b23d1a11f2b
font_01_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 9608 bytes
SHA-256: 3e40d913caeae784c841c914518fadbe1ea4097e039363c50a4400347efde863
font_02_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 10316 bytes
SHA-256: 14e78bedbca865bb07fd37372c1bc59622f27f231eaf8459239815fb22d25532

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