Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44f5980aa3b645b…

MALICIOUS

PDF

78.1 KB Created: 2021-02-18 17:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dba7c6bb11f363428d0cb5220431ac76 SHA-1: 8280f262b2438feb1995b1a9e29e516628cd5a51 SHA-256: d44f5980aa3b645bd486482297b0c9e5c7972e7fb1ef60806f9e78658d3f6a51
196 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which point to a link farm designed to redirect users to potentially malicious content. The primary lure appears to be a "free download" disguised as a document related to "Matlab increase subplot size". The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=matlab+increase+subplot+size PDF link annotation
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/letob.pdfIn PDF document text
    • http://tekirivira.iblogger.org/11648236566.pdfIn PDF document text
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/jugiwiwirexi.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/6982247.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/bAiiU93/happy_teachers_day_greeting_card_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/b6hjXPi/daninokogegalib.pdfIn PDF document text
    • http://nimojojisox.22web.org/40653491126.pdfIn PDF document text
    • http://lufesemi.iblogger.org/77425991546.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/hcABZxO/movajamibalabome.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/ggsNhio/clicker_heroes_calculator_ancients.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufemeg.epizy.com/company_of_heroes_2_master_collection_vs_platinum.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/pivot_animator_character_s.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/barcode_maker_5._5_free.pdfIn PDF document text
    • http://tagafivufexe.rf.gd/tanezufipapovaxana.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/lemixapuf.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/gambar_asmaul_husna_beserta_artinya.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 5124 bytes
SHA-256: 87462f871e220a43e591e0ae3fc7ca9110046d872cfbe348f9f09ecfac68a61f
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 12916 bytes
SHA-256: 1ed0c6a737d1132ad96de8ad3201ff97285ade3240c63afe126cba39165c1106

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