Malicious PDF — malware analysis report

Static analysis result for SHA-256 4661a1897dfa2c04…

MALICIOUS

PDF

84.6 KB Created: 2020-12-20 10:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f68043de0476e7239fc6f32d484ef838 SHA-1: 7283962dd94d861f118645f69ae87b653b09b7cf SHA-256: 4661a1897dfa2c0497fa0cafdd2b3d993758298d6189f1dadbac253870f443db
214 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The document's content, though heavily obfuscated, appears to be a lure, possibly related to legal agreements, to entice users to click on these malicious links. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://traffine.ru/strik?utm_term=temporary+custody+agreement In PDF document text
    • https://xosavufubat.weebly.com/uploads/1/3/4/3/134346154/demigotub-tatilanenufa.pdfIn PDF document text
    • https://nobozufale.weebly.com/uploads/1/3/4/3/134322784/gegizusetudixokovan.pdfIn PDF document text
    • https://nejufolij.weebly.com/uploads/1/3/4/8/134883139/f262a80e383.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/8937815.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/zitelofunux_duwubipiw_malupo_saremetufaguno.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/d257d7292f4.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/74584bd83dde3f2.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/wiluma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc799c9a4492a057e246fe7/t/5fd6d632c4373837b91c95d4/1607915058786/79593354248.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/didexeramaxasu.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/98886980609.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd55bb6394b41d64250a19/t/5fdd6fbaa3b92b153c0d6bb2/1608347579027/45604545909.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/weather_report_karnal_haryana_today.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/sanfrancisco_bay_blues.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/gb_whatsapp_7._35_apkpure.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_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 5412 bytes
SHA-256: f8f5e21024d8605fa4e3c3fba1f02f92dca254b55a9d0e42423bcfab338561e7
font_01_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 10128 bytes
SHA-256: b70089d52f87badc16be7ef73f28e5a86b647d35cdd7874dbc420f8d7e48c88f

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