Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d43378197769b7…

MALICIOUS

PDF

75.4 KB Created: 2021-02-23 17:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e55cc669d390e03eec1305ac6d976e0 SHA-1: a00799d48157e27afa55fc93190cfeb6edf8485a SHA-256: e0d43378197769b79cb2f2a24dd05cfc30ca0341fb28f9b6312171e62d2179b5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a common technique for distributing second-stage payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=livro+vidas+secas+de+graciliano+ramos+pdf PDF link annotation
    • http://gmetry.online/where_can_i_learn_jeet_kune_doqja64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_602bb148e1dd5.pdfIn PDF document text
    • http://itali-big.space/47150206148ahi1x.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/idHibjb/color_fill_3d_game.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/livegegura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5ff536f48ef12.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/3377380.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/gabosoz.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/56c18d95de27997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487632/normal_6001904a42317.pdfIn PDF document text
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/4676851.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/0gdYtD5/survive_on_raft_crafting_in_ocean_mod_apk.pdfIn PDF document text
    • http://lidlid.xyz/migalomanajixigoginufu7xeat.pdfIn PDF document text
    • https://tokemata.weebly.com/uploads/1/3/6/0/136081978/tadusapimikovotul.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/tajiwukivujukejedowe.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/gebukil/ap_module_grade_7_3rd_quarter.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_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 5476 bytes
SHA-256: 3964606ac47e33088573ab75091fd0966640d82d6fc41c4d3df75c73edebd597
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 13008 bytes
SHA-256: beb42193b8bea35b3b67ad7f4b8f2b17b18ba8f7b1c3e2fbfc1fe28454a57da2

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