Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b1b6490fae5944…

MALICIOUS

PDF

72.2 KB Created: 2020-11-30 03:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 07ce7b65bd6aefed0681c3735999bba1 SHA-1: b0e0b89199b4f60c9ef5deedca0dea5119f9e217 SHA-256: 22b1b6490fae5944398568d874725e89af8941c021c90ec291e68013c38dba69
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an urgency-based 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=lumpkin+county+jail+inmate+mail PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488101/normal_5fc0f41728574.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/mabowetezafenijusut.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/572024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f8811676f8e6.pdfIn PDF document text
    • https://xowazusutimu.weebly.com/uploads/1/3/4/8/134880561/91ba98.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/xeroguru/2014_cadillac_ats_2._0t_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3b0439-ac7f-4075-94fa-4e8dd2436845/tati_urban_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f47c845-f30c-4713-b2a9-22508b7a212b/nijawurisoruker.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/enigmatica_2_light_power_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bd0f0f-defd-4a7c-80a1-4df3e3a39d23/zerolugabigame.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/jutowovanatowexakuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/rean_schwarzer_ogre_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cea3ce-1dd4-47e5-b837-826691c1a211/91918878868.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/bilem.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 4868 bytes
SHA-256: 9a4251a47eb5750636afa83c5d0e450c08f34bdc22d6955a7171e418af475613
font_01_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 10324 bytes
SHA-256: b708e4f3479ee94a484bee57c730cb3451539d3b4ea5b42a99a661fe755de7c7
font_02_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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