Malicious PDF — malware analysis report

Static analysis result for SHA-256 2930b89e3a196506…

MALICIOUS

PDF

71.1 KB Created: 2021-02-13 16:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 514f7caf3dfea05c4a5ceff96b8492e1 SHA-1: 75115a782341775f077e99433e4f7e423cb6cda4 SHA-256: 2930b89e3a196506b2eab9919574dfcef52b0bf9e3f5e4da5ddfea201c4a784a
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it is designed to host numerous external links. The primary malicious URL, 'https://baarspo.ru/123?utm_term=how+to+draw+animations+step+by+step', is presented within the document body, suggesting a lure for users interested in drawing tutorials. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baarspo.ru/123?utm_term=how+to+draw+animations+step+by+step PDF link annotation
    • http://nevoxukuri.22web.org/mississippi_hunters_ed_test_answers.pdfIn PDF document text
    • https://zaluzukefajol.weebly.com/uploads/1/3/5/4/135400247/zetuzuvajom.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/wisefavarorul-dizanagubabe.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/zilasebupinad_xufamin_joverenude_jawokuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/51536353223.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/81738232467.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/linen_sheets_bed_bath_and_beyond.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/87913338545.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/30593449447.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 5156 bytes
SHA-256: 7c1d87a06bf0837c982cec57b67e797fae47b6cb3bcaf7a2b1a00723c4536585
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10496 bytes
SHA-256: 29f873339a60f2c3bf66ccb462fedc31ac51e3566f6bcde5eb1266319b3536e8
font_02_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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