Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7a6b1d0ad565a1…

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 10:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3eec384eeb2ee35933a8470c8167fba2 SHA-1: db6f833b9d63e3d944600f70a3dc4d15bf0226ff SHA-256: 6c7a6b1d0ad565a1270aee3f0d2c1c6745f0c8b8e09a7bed14935334c8eef2dc
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/123?utm_term=axure+with+crack PDF link annotation
    • http://tuzupibu.scienceontheweb.net/winebilasupamosa.pdfIn PDF document text
    • https://seguvixezamab.weebly.com/uploads/1/3/5/9/135961197/95e3b0.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/8854bcb89.pdfIn PDF document text
    • http://montana-media.com/748160795388vu6k.pdfIn PDF document text
    • http://leree6.club/shockwave_support_poep8jti.pdfIn PDF document text
    • https://memonimip.weebly.com/uploads/1/3/5/3/135349780/8761765.pdfIn PDF document text
    • http://clubstore.pro/simeon_panda_mass_gain_extremeb42zb.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/ziwetodobat-funifub.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/34578966293.pdfIn PDF document text
    • http://bioforce-co.site/photoshop_action_free_wedding0d4wy.pdfIn PDF document text
    • http://euroshopme.site/nutrition_label_worksheet_answer_key_whopper_sandwichkck0x.pdfIn PDF document text
    • http://topstop.site/crowded_house_band_2020yqyiy.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/catecismo_igreja_catlica.pdfIn PDF document text
    • http://replyua.site/ragajesn8gp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_d4a9c49657bf488ea32d210557db67ad.pdf?index=trueIn PDF document text
    • http://ralepixevoz.epizy.com/pexejetuputasefezij.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/52151958511.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_7d9000358ec844a3bf93b28bf5091315.pdf?index=trueIn PDF document text
    • http://vunefukovamin.rf.gd/gofunufaxixeniwilijo.pdfIn PDF document text
    • http://bivoxubi.epizy.com/rockstar_movie_free_for_mobile.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_302d5066d31a46a3a9dc12b0b2eeef02.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_e0c2bdef7f3845ad90496ec6f606855a.pdf?index=trueIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_7453501e5e3b414caa151933692ca47a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 4888 bytes
SHA-256: 87938106b9b35cba6dd24d7ae4c8d1f1e478af7dd632b3fa3def16c114e843e2
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 11120 bytes
SHA-256: 0ef56a1a986a9728bc32ae67cfbba1f34445777e25abfa81f1145df498f690da