Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7798a46f3ad3783…

MALICIOUS

PDF

75.3 KB Created: 2021-02-22 21:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cfbe2190ca04e914104e2e2185314e29 SHA-1: fa88e958d2ea5f479dc5af4e00623e7d7a5bec19 SHA-256: f7798a46f3ad3783d28ad08f75da114f1be5ea056b83bc45d125043834f9b824
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://druttle.ru/wix?keyword=chapter+8+quiz+1+geometry+answers+form+k PDF link annotation
    • https://tatudibew.weebly.com/uploads/1/3/0/8/130813899/18bc09e2367.pdfIn PDF document text
    • https://xajekedifa.weebly.com/uploads/1/3/4/4/134469171/4896528.pdfIn PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/d71871b98b57117.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/097f5.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/da2a35b3cac3f66.pdfIn PDF document text
    • https://mofumamivuzav.weebly.com/uploads/1/3/1/0/131070192/suvazinegazovew.pdfIn PDF document text
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/13b6f.pdfIn PDF document text
    • http://tosety.xyz/ci_tt_mt_trong_ting_anhs4fip.pdfIn PDF document text
    • https://sitizoxibe.weebly.com/uploads/1/3/4/3/134317871/2c744683d420.pdfIn PDF document text
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/866650.pdfIn PDF document text
    • https://zuginapox.weebly.com/uploads/1/3/2/6/132695273/wavoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotidox/bupafozajotopironenejuv.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/zinixalufodevo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/juneau_county_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/bolo_de_chocolate_liquidificador_para_forma_retangular.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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 5868 bytes
SHA-256: 84b07bcd7f5727d298685f1370340c27ee4bb440e40f5f18a8bc4a052efe6edf
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 11196 bytes
SHA-256: df005fdcf43714b7376fd3f743d97719f85ee3503e00c1cb89f6a678963fc6ac

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