Malicious PDF — malware analysis report

Static analysis result for SHA-256 20776dabb9950b08…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 13:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 72ba97f2229e63f8f6e88347d1787d72 SHA-1: 6b51615190f1d3962898f211e70003c08d9095b4 SHA-256: 20776dabb9950b0876347ec5cd2845a066a8cd0187f1a77a3d6cf7439d35b376
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous external links, a common tactic for phishing or malware distribution. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick the user into executing a command, possibly to download and run a second-stage payload. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://seumenha.ru/strik?utm_term=desktop+internet+shortcut+not+working+windows+10 PDF link annotation
    • https://gumoxeladupeguv.weebly.com/uploads/1/3/4/3/134318886/vegirot-xejovazir-sesuvepumef.pdfIn PDF document text
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/4282132.pdfIn PDF document text
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/d9a81bc0694736b.pdfIn PDF document text
    • http://idem-peshkom.ru/litozemuihryx.pdfIn PDF document text
    • http://lngcliente.com/agostinho_de_hipona_biografiaot1l8.pdfIn PDF document text
    • http://clipshd.design/81247383176j42op.pdfIn PDF document text
    • http://4gusevshop.space/lamborghini_song_mr_jatt_2018wawne.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/47dd1543.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/ritoma/bellary_naga_kannada_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/az_900_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/pukerisemarizubodini.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/66074849617.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/97442582725.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/89412465204.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/wapomiwixutuzekuxobejawe.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 5324 bytes
SHA-256: 057e2ef71fb6f6710c7297f601e0208a351e70062dda03c69746d813db23cd0e
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 11052 bytes
SHA-256: 2e5538fafdcf2939b1900ba9fbc41fb15e9b0f7a4e588c1e4a0e74915e4a9606
font_02_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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