Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4619adc0231481…

MALICIOUS

PDF

68.2 KB Created: 2020-12-11 15:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4a42984febc128adc86bb22bfade9535 SHA-1: 929ceb6144f9677fa4eaea204c140c2423d913c9 SHA-256: 2c4619adc02314819990c0df95238ee74e551234ed47232629d45b11f585678e
156 Risk Score

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 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=prokaryote+eukaryote+worksheet PDF link annotation
    • https://gozisali.weebly.com/uploads/1/3/4/6/134670052/787a9e3091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_5fbf1bc3219d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5fc534691820e.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/zedilegol/29106475314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b43dd24-7667-4fd9-8b5b-d5e03758db2e/osrs_elite_clue_scroll_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/smurfs_village_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b4e5dd-d0f9-4c00-8b48-1a9fba1fada2/87461201784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ab5eb0-05c6-49be-81b6-ff66f7334335/9951612433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0037198-d051-48ae-9b9c-64e1ae448c89/laura_san_giacomo_boobs.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/14327881146.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/everglow_chords_piano_sheet_music.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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 5000 bytes
SHA-256: 3076a8986678bca8079d86ec350794c4a06a3a1b4b2df62f1407267b54b9f3bb
font_01_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10368 bytes
SHA-256: 9440bd57055de5dc1e32679d12a3f7bf60a0f11b2ba7be7400d104b63a1a3ca7