Malicious PDF — malware analysis report

Static analysis result for SHA-256 619618e14b8f267b…

MALICIOUS

PDF

70.1 KB Created: 2020-11-25 04:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8928098f128149cb1062396d88c7bd11 SHA-1: dd63bd6df1144b8c7ce5aba017c275807119db85 SHA-256: 619618e14b8f267bb22eee43f631f0b361a6778b27e8c580f064a453b366db99
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 6

  • 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.
  • 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://trafffi.ru/123?utm_term=irql+not+less+or+equal+ram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f89fc25ae823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5f8be205efb04.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/bupenafutapepukakase.pdfIn PDF document text
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/457947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f8afbc3ce318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_5fb7403e83f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451033/normal_5fb989e9f3034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5fa82f80514b6.pdfIn PDF document text
    • https://xukaxikerebata.weebly.com/uploads/1/3/4/0/134042698/fopulizijemosubadago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fa459826e2a9.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/rawesaragegugar/tom_robbins_exhibits_in_seattle.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/dikopagowuzeda.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/nozufinagupugi.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/jakujefolo.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/taraduvat.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/27642344072.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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 4896 bytes
SHA-256: 0d4de25545a775db7281ac56493d8c956be819a84ac55934aef9c7d7d12284e6
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 14600 bytes
SHA-256: ba8b1de894f7140273b8b3318ad555ee0e30ff927706e82cc5294e88da4abd0b

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