Malicious PDF — malware analysis report

Static analysis result for SHA-256 67532e735d7f9045…

MALICIOUS

PDF

74.7 KB Created: 2021-06-05 07:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9748373cdf73a626b965b29bdb41dde3 SHA-1: 4cb3b05b928b2f906c7d92632cf9351ef8c4a0ec SHA-256: 67532e735d7f9045830a7495e79f8cea4f411bb868452ad2e0b0925e47a33bdf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/pbw?utm_term=manual+de+construccion+con+bambu+guadua+pdf PDF link annotation
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/774111.pdfIn PDF document text
    • https://tinuxapesizagi.weebly.com/uploads/1/3/4/4/134440362/210673.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/2143631.pdfIn PDF document text
    • https://kizatoruzosij.weebly.com/uploads/1/3/0/9/130969146/zagevatowoni_waxumigijevoduj_wibebo_notifogesid.pdfIn PDF document text
    • https://kudiwugeditonaf.weebly.com/uploads/1/3/5/9/135964520/jokedave-febujulafotu.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/19d98ddb.pdfIn PDF document text
    • https://fimelaxezabu.weebly.com/uploads/1/3/4/6/134622198/ae99dd3ac.pdfIn PDF document text
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/xefifupamaru.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/2316587.pdfIn PDF document text
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/vofusevek_putukaxagobik.pdfIn PDF document text
    • https://ziwevanefenej.weebly.com/uploads/1/3/4/5/134591483/durivutafelidowobat.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/c3bc09a89272cb.pdfIn PDF document text
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/menesekinedugivosat.pdfIn PDF document text
    • https://zorajifedimak.weebly.com/uploads/1/3/1/4/131437130/575c764b540.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/1349579.pdfIn PDF document text
    • https://sojoxatufuwi.weebly.com/uploads/1/3/4/7/134710771/nupepepakumid-xezilemonumivuz.pdfIn PDF document text
    • https://vunabiripiboxuw.weebly.com/uploads/1/3/4/7/134756527/6c4b7fe34.pdfIn PDF document text
    • https://wipaluxeko.weebly.com/uploads/1/3/4/3/134346688/zaxedizijirono-vinev-bozonizawoxuge-mopitijogazevo.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/jifemoda.pdfIn PDF document text
    • https://siridadujaxata.weebly.com/uploads/1/3/0/9/130969300/xumaror_lofetulem_kelud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibegenav.pbworks.com/f/opinion_writing_sample_grade_4.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/wigofataxunulisagatedavux.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144506646/how_to_remove_bag_from_munchkin_diaper_pail.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426147/temekaz.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/winabazezi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 5620 bytes
SHA-256: e274f95863231c61c7729380bed5d8e6b010cb95db072574521504c3719dd226
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 12064 bytes
SHA-256: 031cb61eda0d28be500f2538d4dadd7cf011cc8742a4c1096cdb85a7531038d0