Malicious PDF — malware analysis report

Static analysis result for SHA-256 47901d30c4219c7a…

MALICIOUS

PDF

71.0 KB Created: 2021-03-27 19:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7c3b775e1f86d7852ae6cb5b7bf680e3 SHA-1: e84f2169d99db1b7087ad3404ede2433b4bf92b1 SHA-256: 47901d30c4219c7a0135eb3b1a31a3ae557d8b6ac52a41ee31be6bea7e2fbdf1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/123?utm_term=news+report+template+ks1 PDF link annotation
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/6941733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5fedab8552661.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/a653248ec140f.pdfIn PDF document text
    • https://gikemozepuv.weebly.com/uploads/1/3/0/7/130740444/3171014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5ff29cd376429.pdfIn PDF document text
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/vevefak.pdfIn PDF document text
    • https://zivibesojosilit.weebly.com/uploads/1/3/5/3/135304262/zakoxawiresul_wowojete_netewokotedudis_xewotiwijepeloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_6056a49d45f41.pdfIn PDF document text
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/304b436a47c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fc7515d19552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_6037ff390c49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fe882ad97010.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://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_9dc5880d61704645b98e86993ec08436.pdf?index=trueIn PDF document text
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_ce33624dd0514c0fb9ed4bd63d77b072.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_30e447633d104bc5ba423046ce5761fe.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_340d497c367b44d5adebe728419b44a2.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_20eed21cddc64194b125a1fd9bd1fe3f.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_692225083f5541009a3154bf8bf3c254.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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 4776 bytes
SHA-256: 7dd58b43aacc21e4117f80bf3db221489b5d6ab62bcc6933e1046a6007569d22
font_01_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 10184 bytes
SHA-256: 54a016b7ee57498179fc65ccf203b49e9ef135c378c588d63fce5a06dd4e82a5
font_02_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f