Malicious PDF — malware analysis report

Static analysis result for SHA-256 1666999c4d9a7ef7…

MALICIOUS

PDF

70.9 KB Created: 2020-12-10 04:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33a8328c5b7e2062f152611f21fbf1ab SHA-1: d879fcef9f246ddd8ca43fbbe6ac30760fcb3202 SHA-256: 1666999c4d9a7ef7931a0bbad32341276783bbea75607173255f58156842982d
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to benign-looking PDF files, but one critical link points to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and contains what appears to be metadata rather than user-readable content, suggesting the primary purpose is to host the malicious links.

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
  • 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.
  • 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://traffset.ru/strik?utm_term=what+happened+to+showbox+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5faeee516e95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f8c3dc8acbad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467589/normal_5fc673b64b85e.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/fepakiper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447487/normal_5fc75752d9104.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/5fbce344be7cfc36344e8aaf/t/5fbf5a21e18c5c478ef3437c/1606375970722/sony_portable_dvd_player_dvp-fx750.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/jomadojewinidiputoduf.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/56914974501.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/autograph_1080p_hd_movie.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51a9dbe9b69395125fe2b/t/5fc937408ae5b409ccaa2dd3/1607022400834/pisapamusur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00a5311f6a4198480ec6e/t/5fc1c6e261e25426e17a1238/1606534882573/nefopi.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/73950429427.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4bfa2bd14ff0dd2b5522a/t/5fc72bfd788a962b7c29e362/1606888446853/mlb_playoffs_2020_bracket.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/kizovifusumatiwowasi.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_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 5296 bytes
SHA-256: b14bed4f20f99d8b464c697a52af7c8498453069b25b03b6fac8761e9921aa03
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 10896 bytes
SHA-256: e70fb414b7e31d1d7efc8b4e728e786f4e92ab0fe7d2e57929500b52062b5d11

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