Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fb1f83f9e2e557…

MALICIOUS

PDF

81.6 KB Created: 2021-03-30 15:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ed1a86f74dd61cbb0d65f6f97c2efde5 SHA-1: c6109c46105c95f566b62f6f9caba8d6eb0acc8c SHA-256: 57fb1f83f9e2e557f9dc7f7cfa92064a53fd06be09f1bea800bfca23d1aa093f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content.

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://dugedepap.ru/award?keyword=game+of+thrones+season+7+episode+6+script+pdf PDF link annotation
    • http://tumbochka.space/nystce_esol_116_study_guidebqeyu.pdfIn PDF document text
    • https://kumexaper.weebly.com/uploads/1/3/4/8/134882622/totesiwuxawu.pdfIn PDF document text
    • https://gatodagimisosog.weebly.com/uploads/1/3/1/3/131379801/vurisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_5fdb515eee23c.pdfIn PDF document text
    • http://worldhold.online/zebra_zt410_service_manualhvjh9.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/are_any_vampire_diaries_characters_in_the_originals.pdfIn PDF document text
    • http://drilltech.info/kasemeguridesosetuz02gq.pdfIn PDF document text
    • https://neletataw.weebly.com/uploads/1/3/1/3/131398134/1681645.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/nakebe_dupumokigot_liligawevukuvoz_najipuge.pdfIn PDF document text
    • http://ighelpcenter.xyz/how_to_install_diono_radian_3ra5cyw.pdfIn PDF document text
    • http://psylath.com/99591273406k3f8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_60332ce976800.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/knee_pain_rehab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5ff30e11a6ac6.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/da8c5219298.pdfIn PDF document text
    • http://hookup750.website/95051882830jeyu8.pdfIn PDF document text
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/6179582.pdfIn PDF document text
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/5363291.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 5628 bytes
SHA-256: 8112beff6ae376de5a0b3637b7f335cbe9e39ab444e159cf6b0b0976b1146d3d
font_01_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 10944 bytes
SHA-256: 6f19fd065b438434de61bc4110eef58595dc5a99aa533e9b4b89e1a260723e77

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