Malicious PDF — malware analysis report

Static analysis result for SHA-256 f856ee649137eeff…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 09:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8e271be40d33519a5bd5be6f605ab68b SHA-1: a589fc1841f9e241a3a294be3143e3e2b3a2d975 SHA-256: f856ee649137eeff977ee4564a58dde2d5908bd95faec843c1dfba46a70ed0cb
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests an attempt to manipulate search engine results or distribute additional malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and SEO keywords, reinforcing the link farm hypothesis. No scripts were extracted, but the PDF structure itself is indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=trusting+god+day+by+day+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403260/normal_5fcb01e19a04a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_6007c5be237b4.pdfIn PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/napufunasune.pdfIn PDF document text
    • https://novifofogabux.weebly.com/uploads/1/3/4/3/134371065/212599.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_60072f1d8ea6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_6010f9a81ff6d.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/razememej_vofatiwap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6016ba39ec8aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5ff9edfaee8e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_604ab3ad909a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fcd784ea84e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_60353f5eedfa6.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/jalasilunaz/13952319146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ebd5bd-2faf-419c-b63e-64177785b5a9/27705595834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951a544b-5715-4301-868c-d901f9ea8523/how_do_you_restart_a_samsung_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a741ba-8c37-44e8-a99f-c99752b8f67a/xidepugotuvaxonapafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2adb881a-8a35-4fce-a1d3-f5a1764992b6/rururexidixiwidamel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2726fea-c074-464c-9e06-37af402fed56/37302854752.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/bumavukikuwefomomifuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/wall_street_journal_review_section.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5252be00-7b0d-49d7-bbf7-6d8039a9dd10/1965_cessna_150_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f338da-f2f9-4e60-89ee-d8526f7fd18e/are_electrolux_refrigerators_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f79f21-d90c-4f91-9078-966ee99ba65e/82091106819.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_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 5376 bytes
SHA-256: f2d2542178936622ce502323227ce6794f6e575cfa92a298542b4ec7f470447a
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10728 bytes
SHA-256: 24bb622bc859deafd328de55d06f292850d3b034f46e07755b21abf2f428105d
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f