Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ced963d0ff274ca…

MALICIOUS

PDF

85.4 KB Created: 2021-03-03 05:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 51ac0f29e5ba1a473cba6d61e6978545 SHA-1: d3c828f9104f9c5414427eb14d82332bfa8e493e SHA-256: 6ced963d0ff274caac5bf7e1d8d1a2e391a9998466da424c857255afb29e2c47
254 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are designed to appear as legitimate document downloads but lead to malicious infrastructure.

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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=fundamental+analysis+of+stocks+india+pdf In PDF document text
    • https://zuxijonimobazi.weebly.com/uploads/1/3/5/3/135351106/wegezumaburo-tuxixasez.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/1928123.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/muzujogenuk_kokasuvij.pdfIn PDF document text
    • http://milanomoda-italy.site/patras_bukhari_books_free_downloadab3i8.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/gememu.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/wezusolatirarar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mejobu/pdf_biochemistry_for_medical_students.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/d_d_character_sheet.pdfIn PDF document text
    • http://zaximibirada.epizy.com/bimoz.pdfIn PDF document text
    • http://raxexirep.epizy.com/what_are_some_landforms_in_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/lezuxinasudirelavufu.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/82838462013.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/cltd_exam_content_manual.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/fusapaxevax.pdfIn PDF document text
    • http://molarawofopojib.rf.gd/nusogamajisoziwivotojidi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 5208 bytes
SHA-256: 9f92ab602a946649ae6e328d329ce53afd508d8e5143fb9096b172e7eb82a80f
font_01_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 10924 bytes
SHA-256: 15bf2f657128d3485f07967641a8ab1fcb8e8ff17fcf2eeb27cf10a230111c8d
font_02_sfnt_off00013a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A37 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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