Malicious PDF — malware analysis report

Static analysis result for SHA-256 864caa7215c882e6…

MALICIOUS

PDF

79.9 KB Created: 2021-03-21 23:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 98fbc54da2568711c9c0fec3aadb2a92 SHA-1: c0c13f7a4999e20b27e894e502fc75ada709d9fd SHA-256: 864caa7215c882e69ac29fd4beb72d35b4c0f31dfd384ddd41200722616582e3
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by heuristics as a malicious redirector and phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to career aptitude tests, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=myers+briggs+career+aptitude+test+free In PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/lunovizopomejaz_xefatenijonopu.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/bedufudugin.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/e5f11e2d13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fdf543c5a22d.pdfIn PDF document text
    • http://tk-pobeda.site/security_analysis_and_investment_management_bookspsz3.pdfIn PDF document text
    • http://tohld.in/samsung_ezon_shs_33215y0ni.pdfIn PDF document text
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/a9e8d7a995acc58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_60199d3049d1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5febb16b6248a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6016126f173c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390323/normal_60038c912590e.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/dowate.pdfIn PDF document text
    • http://geosen.net/alimentos_que_fortalecen_el_sistema_inmunolgico9r17s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/60728634327.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/ashley_madison_former_ceo.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/golabakuriziduwutaf.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/wonder_r.j._palacio_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/vedaniko.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/birkhoff_algebra_moderna.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/best_platformer_games_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/esv_bible_online.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_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 5540 bytes
SHA-256: ff1856bf5a6abd397700b40cb602f06fd117a1208e58d38114f8aefb85a1e83f
font_01_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 11092 bytes
SHA-256: 8a8d5cafa50ba114571b3bcfea6efaa69bb3193700c45d13ead76fd1dd3e4c91

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