Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1e5a3d13b24ca9…

MALICIOUS

PDF

84.2 KB Created: 2021-04-02 22:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 79e3d76decbd7baf2d5a522f9a8c3589 SHA-1: 3d9a80e9431ae918a53ba99de6fa0813315c6a1d SHA-256: ca1e5a3d13b24ca93242426a688440868fa512585f19cfbf1ba40192787a7098
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://ponafet.ru/strik?utm_term=how+to+change+a+ceiling+fan+downrod PDF link annotation
    • http://kzrovk.xyz/declaracion_universal_de_los_derechos_humanos_1948_articulosbgzdt.pdfIn PDF document text
    • http://manthoughtswebsite.website/xemezitov5bhqu.pdfIn PDF document text
    • http://insurancesouk.com/fosekimopobovunezesapotjn9e3.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/gusigojupagu-nigiwukabexudom-semavanuxi-josufikip.pdfIn PDF document text
    • http://tevfikyuce.xyz/badminton_league_mod_apk_old_versionw8uk2.pdfIn PDF document text
    • https://wademaleg.weebly.com/uploads/1/3/5/3/135346716/5255587.pdfIn PDF document text
    • https://vesekukoluvili.weebly.com/uploads/1/3/4/7/134759730/582d1edf.pdfIn PDF document text
    • http://uablog.site/wixowabadenopabusudodigup0g.pdfIn PDF document text
    • http://cz-nitrof.website/zoom_cloud_meetings_free_web_applicationz32d4.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/2adda1ec31d.pdfIn PDF document text
    • http://decideyouself.fun/concept_of_physics_hc_verma_in_hindi_downloadbt7au.pdfIn PDF document text
    • http://registrat.space/ilustraciones_para_predicarwaxqm.pdfIn PDF document text
    • http://specrazreshenie.com/sekonic_l-308s-u_manualpz7fe.pdfIn PDF document text
    • http://instapodarok365.site/750169601639asqk.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/tixexakilajisodobuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_334c2dc45d7b415fb07e605395840ed5.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_478a899ed29f44fea0ba15da8ba3aed6.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_e540857c00854a55afefd97416600af7.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_b7ae070818fa46b0bbd71738f6b9ea4f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 4944 bytes
SHA-256: 2262c52b9dd8e9107d9752d5bbaf267f3eee1310de5ca2a3ecab569579903310
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 11532 bytes
SHA-256: 96e05f8da916fa5c3a4e9ce0c2efaa517e14f4687ad3b26e9b7c7d8a3e48dd01
font_02_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2