Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f69fe6da8f9ad1…

MALICIOUS

PDF

76.4 KB Created: 2021-01-31 16:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cdb62e7ba53e2ac8a5a8910ef99cc4a0 SHA-1: 36939f31aa2d33c5863d44260ba15da125001b05 SHA-256: 35f69fe6da8f9ad1131ccff362ab6749561bedba767cfc6d7c3e870b16dbc840
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness. The document body is heavily obfuscated, but the presence of external links and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/123?utm_term=chinese+watercolor+techniques+pdf PDF link annotation
    • https://cdn.sqhk.co/letaziseb/ijhiFgd/sikosabe.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hbicOgg/s4_live_wallpaper_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/fotutubujuf/vhcbtjB/44919322216.pdfIn PDF document text
    • https://vatilevemuwaji.weebly.com/uploads/1/3/1/4/131453872/da1b8c9bd01b0.pdfIn PDF document text
    • http://ramosek.iblogger.org/discussion_forum_template_bootstrap.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/1906316.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/fPiaegd/mibamodab.pdfIn PDF document text
    • https://cdn.sqhk.co/gewigerajoru/jc6jf20/tuning_fork_hearing_test_hz.pdfIn PDF document text
    • https://jinafoxibufesow.weebly.com/uploads/1/3/5/2/135293268/2312258.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/W0ghbeu/home_assistant_alexa_media_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/janodojivi/danganronpa_v3_class_trial_3_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/androrat_apk_for_windows.pdfIn PDF document text
    • http://samanoniminowut.epizy.com/free_medical_education_powerpoint_templates.pdfIn PDF document text
    • http://mekavebij.epizy.com/5089624679.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/zawifenezoda.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/jotomodulat.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/62957450844.pdfIn PDF document text
    • http://zekubegem.epizy.com/who_iycf_guidelines_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/total_war_three_kingdoms_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/nedelopi.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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 5368 bytes
SHA-256: 6413f6141341e81f238cf39c9008e0cf0f631bb34d2f4478b1b0b702a85e44d5
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 11424 bytes
SHA-256: 95c1ec79ef2c4a483764ed1976edf1ec9e43939d933396f4207053affb960b2b

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