Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89e9440f1d15a83…

MALICIOUS

PDF

85.6 KB Created: 2021-06-04 05:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: daefb696bc05c502036269d8c751c60c SHA-1: e951bfe46b8ba95916cfd9fbb30a43c444efa7e2 SHA-256: c89e9440f1d15a83387acb3bc68db2594d5f46f178e54e6f54180135099b574b
194 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 hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Best stock android launcher 2019' and 'wkhtmltopdf', which is likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=best+stock+android+launcher+2019 PDF link annotation
    • https://livekojumezo.weebly.com/uploads/1/3/4/3/134384671/2865444.pdfIn PDF document text
    • https://juvivufoli.weebly.com/uploads/1/3/5/3/135325295/737033.pdfIn PDF document text
    • https://tufizesux.weebly.com/uploads/1/3/4/5/134596030/segexo-fulorubesobagob-powawuromugi.pdfIn PDF document text
    • https://kevefavovedejot.weebly.com/uploads/1/3/4/7/134719756/fagomixubuditopiza.pdfIn PDF document text
    • https://bedimeni.weebly.com/uploads/1/3/4/0/134016729/soposofuz-xelugonejipe.pdfIn PDF document text
    • https://zorelivuveromip.weebly.com/uploads/1/3/4/4/134438733/ad7270.pdfIn PDF document text
    • https://pepodefaposuv.weebly.com/uploads/1/3/5/9/135992330/roxig_ditiwi_zaledabomuda.pdfIn PDF document text
    • https://fawimerena.weebly.com/uploads/1/3/4/6/134630635/4772635.pdfIn PDF document text
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/nusagebasoxu.pdfIn PDF document text
    • https://tufizesux.weebly.com/uploads/1/3/4/5/134596030/7532a0b3cdfbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144519240/95067416742.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144520002/step_by_step_easy_origami_lucky_star.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/90366863767.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/lepujemirilizelev.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/vw_golf_mk7_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f940a01b-5aba-4cd6-a207-19c547e41e59/dyson_dc39_triggerhead_parts.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144534234/central_dogma_and_genetic_medicine_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cae7bc8-ccb3-4ce4-8649-1b491dc810ca/boy_pic_for_whatsapp_dp.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144580071/video_calling_app_for_pc_windows_10_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7e128a-13a4-472d-a180-7332d64596f4/vamuvaxewopekojuxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea472f8-74f8-4f7a-a9b1-4ad85213fcf2/how_to_clean_t_fal_compact_deep_fryer.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/magnitudes_escalares_y_vectoriales_ejercicios_resueltos.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/12981943878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec68f5a9-dd3c-46b2-a335-a5aeb949ee13/alcatel_3l_full_specification.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_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 5624 bytes
SHA-256: cf5dcbe887ee416ec4f64ecd1f51f942388f23bb1d9a5f3cc14e86737f27ac16
font_01_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 10932 bytes
SHA-256: 11758cd89de30a7dcb81764facd1ab079a2afbdf71f10e08af035c959145eed6