Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4826a88b0e159c…

MALICIOUS

PDF

72.4 KB Created: 2021-01-12 16:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1fccf1f2af697a6100ad8d0333dbde66 SHA-1: 518965ccfa6fa7ac2ca953add2bcbc4af6055cdd SHA-256: 8a4826a88b0e159c8cfcf1d0a50b745fd0f3a50c209ca41340316710aa3d15e8
244 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for linking to known malicious redirectors and for being part of a link farm. The presence of numerous external links, including one pointing to a suspicious domain, suggests an attempt to lure users to malicious sites or for SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://cctraff.ru/123?utm_term=great+dane+weight+chart+male In PDF document text
    • https://cdn.sqhk.co/jakufomego/jhCigjF/smashing_pumpkins_songs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/ejcYSii/37665238901.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/dhcqhhg/60906206589.pdfIn PDF document text
    • https://resodafuwagolip.weebly.com/uploads/1/3/4/3/134313475/981214.pdfIn PDF document text
    • https://site-1178505.mozfiles.com/files/1178505/former_crossword_clue.pdfIn PDF document text
    • https://site-1194826.mozfiles.com/files/1194826/formaldehyde_keratin_treatment_side_effects.pdfIn PDF document text
    • https://site-1168102.mozfiles.com/files/1168102/96921216130.pdfIn PDF document text
    • https://site-1178138.mozfiles.com/files/1178138/48844986379.pdfIn PDF document text
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/9576699.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/ibhbFPM/40089181574.pdfIn PDF document text
    • https://site-1172235.mozfiles.com/files/1172235/swot_meaning_in_business.pdfIn PDF document text
    • https://site-1174227.mozfiles.com/files/1174227/wise_eyes_burnham_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iajaQhf/1250539634.pdfIn PDF document text
    • https://site-1177746.mozfiles.com/files/1177746/buzavibalaritirukobezonaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 5296 bytes
SHA-256: 8b42905cecdbb456f32ef447d38cec9303528bdcf95926bae116087088697687
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10568 bytes
SHA-256: fd6f6174730cfd5d98d5cb61e83c7237d22b47bc593536a3fa96f1055b5aad56

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