Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e88d1e8e251f097…

MALICIOUS

PDF

81.4 KB Created: 2021-03-12 08:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 416e79d95431f2a341dd7f8103c37edb SHA-1: ca41611cbd654fd6dc75960929a24677df433014 SHA-256: 9e88d1e8e251f097f89ce486b71dbbb863f605a18366a969a306b434a8450602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or content-spinning operation. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign, likely involving the download of a second-stage payload.

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://vilenefex.ru/award?keyword=all+name+reactions+in+organic+chemistry+class+12+pdf PDF link annotation
    • http://suzupuwejal.mygamesonline.org/is_there_a_sequel_to_the_dark_tower.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/gQgdgjl/super_bubble_gum_vegan.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/weber_grill_charcoal_holder.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/nD9iiii/musically_inclined_antonym.pdfIn PDF document text
    • http://fajamad.mypressonline.com/pafog.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/ehgDicG/fudefek.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/37659529546.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://uploads.strikinglycdn.com/files/10b28d03-7cc2-47ae-8ed9-b7aeac9105cb/38370425031.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/work_timesheet_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/xerikibum.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/beckhoff_twincat_plc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd89110e-cd2d-46a6-83ed-360c0bc5cdb5/69435422181.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/57354533103.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/81932136497.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3f4eea06806b4936bd8c067e5a7250f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63044c26-43fe-451c-85e3-d6512616d52b/brs_pathology_latest_edition_download.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_ef951b6e05af427eacf2f8b1dd1ab332.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c6944c-4486-4ae4-a3a7-ca6389cfab87/how_to_get_gerudo.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_613d96b4d6264b7c977c6adee1be8114.pdf?index=trueIn 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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 5632 bytes
SHA-256: a862df5f577f02acd61c83835fc4b335080de1d50dc3156580270f9352ba7557
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10720 bytes
SHA-256: c48a82797364fb626a7d8bc69ee69be670ea6f290a6a41d48601d5e76e0ddce1
font_02_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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