Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17c98f328cf828c…

MALICIOUS

PDF

105.8 KB Created: 2021-03-14 04:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42449c45c6ba169a949d51f8296dd14e SHA-1: 291671013ce4efa2f3053af956fccdc90cadbc1f SHA-256: d17c98f328cf828ca55be1e61d4a750850ae7f4d3cddbd3721ed3f1977b7d184
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 0.9996

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://seumenha.ru/wix?keyword=yerevan+state+university+armenia PDF link annotation
    • http://luxuwum.mypressonline.com/97093105728.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/rca_model_number_led55g55r120q.pdfIn PDF document text
    • http://uscovidcharts.com/unf_communications_internships602is.pdfIn PDF document text
    • http://strahuemsya.info/162940136106h6xq.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/loxopudizus/how_many_carbs_in_arbys_red_ranch_sauce.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/wagowosavul.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/danegeluxabona.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_76a1acc217064c289d36f785794480c8.pdf?index=trueIn PDF document text
    • http://punegejofuj.epizy.com/759779981.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/pojerew.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_354fc6a78cc14ab086f466a1db54f570.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/xumojigopidawobaxalul.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/41660146801.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/numobejuzuvugat.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_50bc5221de0b4a48bce39ecf97b7c239.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_29469a906d56484cbe7a166bb8fde0b5.pdf?index=trueIn PDF document text
    • http://ferodokibaw.epizy.com/cornelius_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/74655961431.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_96179a35421b47c3848a0631fe5b9af7.pdf?index=trueIn PDF document text
    • http://nobegik.rf.gd/consumer_reports_canada_cars.pdfIn PDF document text
    • http://nopizapokife.epizy.com/robotic_pool_cleaners_consumer_reports.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 4924 bytes
SHA-256: 5c99e0a45594339fea0ee78add6711686bd618c3b54f7f9e2f458d0ba5de8813
font_01_sfnt_off00013b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B41 17268 bytes
SHA-256: 45c722fb80fa6369e1a6e118acb85512e562345038f457e253bc2fa9926eb1aa
font_02_sfnt_off00016fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FAD 23396 bytes
SHA-256: 891834934fce85461837f1f03b0ee05efdc3019871aff307234a5423d8d54637

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