Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84362104ad1bd0d…

MALICIOUS

PDF

75.8 KB Created: 2021-02-16 21:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9bfeee9849a1b243c26e145a852760a9 SHA-1: da2fffcf6d4f91a27a55f5d893f6e642b557e6e0 SHA-256: a84362104ad1bd0dc865fa8f591afc11bac5c563713fde4572c6f8cb17375f2f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs. No scripts were extracted, but the presence of numerous external URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=nordictrack+gx+4.7+recumbent+bike+reviews PDF link annotation
    • http://mabirimelu.iblogger.org/detipobegagofi.pdfIn PDF document text
    • http://lnstagram-helping.live/the_secret_law_of_attraction_videonczb5.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/9758023.pdfIn PDF document text
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/5711843.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/e5pgchc/memebaaz_memes_short_videos_app_download.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/tujase.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/genMheA/benozimukenomizewulemori.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5fe6040845076.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/vezapebizezu.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/haTjjig/best_free_video_tool_for_social_media.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/fikev_bulanapos.pdfIn PDF document text
    • http://bigno.space/blender_2.79_b_tutorialv9zvd.pdfIn PDF document text
    • http://new-leggins.site/5334769799je1mp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_6022f7a2875d2.pdfIn PDF document text
    • http://hookup750.website/79143843150oys7.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/fiwusabo.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/hI3gcnB/galidikefivenekojebaxe.pdfIn PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/datagef-luvutifizevo-raviwaxedomin-sivovuvaxuxaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasemejatafa.rf.gd/lijozejotadaxeb.pdfIn PDF document text
    • http://tunawibiga.rf.gd/74147118191.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_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 5820 bytes
SHA-256: 2386426e2f3a5e444169c47e6b0a6176b67e18c37b524004031da2b347633369
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10928 bytes
SHA-256: 9489f36915d2af1759536882db0285f868c8227c32394129ed83ac3f9720aba0