Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24c8bf6b2bc5bdf…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 18:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b894703e780adf62ad812a87115a10b4 SHA-1: 61147492fe9c7c8d35a5ebffc29e4453af5cf1b3 SHA-256: e24c8bf6b2bc5bdf7c9a759314f233353359c9688f19d7f8f3d6e53be36d9030
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=lyman+ar+reloading+handbook+pdf PDF link annotation
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/letabo.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/fGihv1T/burger_king_ps5_winner.pdfIn PDF document text
    • https://cdn.sqhk.co/xusozapovu/fjgWgiI/starbucks_drinks_without_coffee_in_it.pdfIn PDF document text
    • https://cdn.sqhk.co/dedomafub/DzijhhD/dijox.pdfIn PDF document text
    • https://cdn.sqhk.co/kukabelek/Vqv4Lhb/the_fear_creepy_scream_house_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/zDbphhb/ftdi_cable_5v.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/gjQgfLW/84845161690.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/hgsP5jb/nesigoku.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/mhdZhac/wirerafurakobovonuxobawu.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/mavevoravepel.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/Jb2ikjg/big_win_jelly_mod_apk_unlimited_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/iaoly4k/cloudy_urine_means.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://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_1023e55d95404799943883d5722d7427.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megelugik/virtual_piano_online_music_sheet.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_83f6c889aeed4472ba98ec9795d47af4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/best_markup_app_windows_10.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_65779a4b5e21474c9c16559bcc462828.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/xureboxegutosokejos.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_ef63a5b455594d6caea29a0809ce1a81.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_0c2ae85e01414bd5892ba116b60a296a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vosimalume/datejifa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 5232 bytes
SHA-256: b5c678cb936bf86d2459b52746170cf4cb8484be6348c692c8e2420e777f8ceb
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 11744 bytes
SHA-256: 6bdab38972d6d4f13d851e0bcc5f87e106473fd6b76464abef53b3b8f7a10812
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e