Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5da421cc12bb67…

MALICIOUS

PDF

71.1 KB Created: 2021-03-18 11:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af276668250f45b177cbad7b729597e3 SHA-1: 92a572026674e2dee743faed527f5b8e5c7fac14 SHA-256: 5c5da421cc12bb6763fe0a2fe2148ebcd7803e375ad2c8a16daa00e7a7c35005
186 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 0.9998

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://crophysi.ru/aws?utm_term=dell+e93839+la0601+motherboard+specs PDF link annotation
    • http://dufifudusimube.mygamesonline.org/jurnal_perilaku_altruisme.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/hc5V6U9/85781270153.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/hizvieA/87896732567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6040713a6428f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fcc5e4052789.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubiviv/ctJmxgu/juxeva.pdfIn PDF document text
    • https://rorogujelid.weebly.com/uploads/1/3/4/7/134702732/fobevopodukari-tugotuka-jofudelakog-mazef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5ffce31256ab5.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/idhiprp/2058331496.pdfIn PDF document text
    • https://bejamipoxef.weebly.com/uploads/1/3/5/3/135318713/a5415888afb04.pdfIn PDF document text
    • http://jogajep.medianewsonline.com/askariasis_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/fokivetezabu/wFhikgc/98284555688.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dGN0CQ2/write_japanese_alphabet_a_to_z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/formato_hoja_de_vida_sencilla_2019.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_2bfa792fd2fd4cc2b5d529758b629525.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_4c454f47752d494aaacacf6c7d7744e4.pdf?index=trueIn PDF document text
    • http://nivuzujanux.myartsonline.com/ancient_history_in_english_for_upsc.pdfIn PDF document text
    • http://www.techspot.com/community/topicsIn 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_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 6316 bytes
SHA-256: e2a012d14ef85b06ad38f87a917bd360e2afa57204a22e060722b105f341555b
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10920 bytes
SHA-256: 47a51cce4a78d93486ddfe5f62d0ab28fbc3a43cfb44e1534d94b018b4375000

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