Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a99f56a2b7cbff…

MALICIOUS

PDF

77.2 KB Created: 2021-02-17 05:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8048d243afa5db1d5f4249ef2e52084f SHA-1: 33b90f601237c945a91b5e1da26bc151961d49ef SHA-256: f5a99f56a2b7cbffa375c3c306e711d9e083c3d75cd41ecbd21302bea1e7123f
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=proust+and+the+squid+chapter+1+summary In PDF document text
    • https://cdn.sqhk.co/vemegunir/fdtgeVQ/music_labels_in_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6011c308118c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403680/normal_5ff405c8591eb.pdfIn PDF document text
    • https://rifejosowutero.weebly.com/uploads/1/3/4/6/134691359/jurede.pdfIn PDF document text
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/befaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe4c53424466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fdfdd6b2b651.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/i4FhhjP/pineapple_pen_song_download.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/dubepinimojubegemu.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/difaxekisurup_gusaxiwupaxof_xaraje_xidubo.pdfIn PDF document text
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/dee972c183d.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/bufipevuril/44259224907.pdfIn PDF document text
    • http://jaritiso.rf.gd/8766316433.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/globescan_sustainability_report.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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5560 bytes
SHA-256: 9ba1514669c747455752399cee53514be1e973e8fc55158610309aac7a975a2c
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10388 bytes
SHA-256: 118a990ac8b1ddb7daeeede93e13d7aad7257d3ce65765b3a8b333e59c127b8e

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