Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf8a157cb37ee67…

MALICIOUS

PDF

72.5 KB Created: 2021-02-19 20:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 72d71737e62ede1a75289f139c6646ab SHA-1: 12af78ed2d5ab53f85ef09732aff046799d38397 SHA-256: ecf8a157cb37ee675644d5eb66a02e0b94e608dce25ba48697330270057f2326
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=am+i+depressed+checklist PDF link annotation
    • https://cdn.sqhk.co/pujixefan/qjehihB/cooking_mama_let_s_cook_all_recipes.pdfIn PDF document text
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/jagedugaladi.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/9489322.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/Y1icihc/t9_keyboard_for_android_download.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/mivater_jibavis_vakewof_visonikizemapo.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/64925.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/filatu-rugozogalodifer-sowidazo.pdfIn PDF document text
    • https://wajefoxefibivi.weebly.com/uploads/1/3/2/8/132814680/295eb0.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/igcK2jd/sesotozifajosena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_5fe77bdcc0502.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/jifesu/cruisin_for_a_bruisin_pentatonix_sheet_music.pdfIn PDF document text
    • http://nipuxedexup.epizy.com/38015797538.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/23543611545.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/38554012555.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/angeles_y_demonios_dan_brown.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/kgf_tamil_songs_kuttyweb.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_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 5156 bytes
SHA-256: e587395b5e5a16157dc1a0347aab149743bc275aa5acbab4b8cd937754210260
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10672 bytes
SHA-256: 60f1a9b5e78d1e56a1515b51b52e4c80a4641b30a7ed218179eaa298aaf538a0

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