Malicious PDF — malware analysis report

Static analysis result for SHA-256 864e029b259ed110…

MALICIOUS

PDF

78.9 KB Created: 2021-04-04 14:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd74a2c2105d1c7e3d0101d23c1af6d1 SHA-1: 71d9c28ac8e05db035b54c9359deec290b35ba9a SHA-256: 864e029b259ed11067470e2cca305212d1534baaaf799540d4fbef9d72e1c19e
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=smart+calling+watch PDF link annotation
    • http://melomone.scienceontheweb.net/catalytic_hydrogenation_in_organic_syntheses.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/5c8c30fc3e.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/gvYuBaE/pakonigivofopogi.pdfIn PDF document text
    • https://cdn.sqhk.co/jisesixerigu/icCGpV9/inputs_definition_math.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/lubibenokita_bigazo_bezerotuzu.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/45559062489.pdfIn PDF document text
    • http://pressit.space/how_to_get_oracle_certificationqs7ad.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/453da463.pdfIn PDF document text
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/xijaluwapi-bofulepizatuf-lulerolazojav.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/clipsal_switches_catalogue.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/uhcjyhb/16529520732.pdfIn PDF document text
    • https://moxuranib.weebly.com/uploads/1/3/4/3/134345095/b07c4.pdfIn PDF document text
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/wipepubimamolux.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/wuwaranarebuxadozik.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/where_can_i_watch_stephen_king_movies_for_free.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/ninomaf_kotiwaxin_nunofop_kixebezeserav.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/vobalanolofexen_vidibu_wuzid_xibadamilu.pdfIn PDF document text
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/nuferubezituxu_xikajidupazixi_nepasoxeka_vutonujex.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/ddf87.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/bonux-javupeludix-kimep-vejimarorerul.pdfIn PDF document text
    • http://wellwork.site/584795259769v7z9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 5232 bytes
SHA-256: a9ef277cdaa4a35a9a61f19e7bb6459e08cd6b5ef18f61ef3bd238ad290c6c4e
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 11524 bytes
SHA-256: 85aa886a1d7ba918cd489cee22677b3aa0e3e643b795a8e97673906af55ec089
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 16068 bytes
SHA-256: 2e6efdb6ec6b06881b73571a6dc11127da1b4fc0f11d045bd7c2e12cbfc92ea6