Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a74b2275435be8…

MALICIOUS

PDF

62.7 KB Created: 2020-12-08 19:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1ec76857431ba050ffbe0253d3729c65 SHA-1: de2d7135cf854b0abbd30c2939725a6e53c94c2e SHA-256: d8a74b2275435be8e78c25265eaaeb3e694e291a64cbcd3e3e909ef4dec5a289
156 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. 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 0.9997

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://trafffi.ru/strik?utm_term=lux+geo+thermostat+troubleshooting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5f9ca536e7aa6.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/zidejeme_surujelagedide_dokatamekod_kofawuk.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/7133890.pdfIn PDF document text
    • https://duvonejubuzal.weebly.com/uploads/1/3/4/3/134321315/ed2509566fc833.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/kakekojezutok/verb_moods_worksheet_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0add48-72f1-4772-80a7-8fb082d1b988/gunslinger_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c73cb4-5ae9-4b31-a00e-f3ff6f16269a/12_channel_12_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be5751b-bbf1-4208-897a-86728936241b/12301359070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f762e1fb-0a68-4256-8744-d411007e79cc/manual_for_zte_n817_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/ruwuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95d18c0-8868-4981-a49a-a2e9d67a23f1/town_of_braintree_human_resources.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_off0000ab94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB94 5132 bytes
SHA-256: a0334a06b03ca9b41ee496c07c95ca5519bc5c3139f673734dea5f0f38f566e8
font_01_sfnt_off0000bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 10348 bytes
SHA-256: 574a32652f1877e1993e9e11b445b84d2e22c3ca9b452a06d9b84b3b87838775
font_02_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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