Malicious PDF — malware analysis report

Static analysis result for SHA-256 a877bee74c4b6059…

MALICIOUS

PDF

78.1 KB Created: 2021-04-16 22:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0f0104e02a9453aa0e478b0e4b441392 SHA-1: 26c3ebe9e71e7d02e9ab1b0452ef0e1c2bca2d7d SHA-256: a877bee74c4b6059a1fa56fc87adceff63f761efca586a8bbe45e2cc8dbfe5e3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicating a potential link farm or distribution mechanism. One of the embedded URIs, 'https://botokaw.ru/strik?utm_term=i+don%2527t+want+to+go+to+college+uk', suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation for client execution, likely leading to the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=i+don%2527t+want+to+go+to+college+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389797/normal_60621c9b2238f.pdfIn PDF document text
    • http://13millions.store/5787098332241ek8.pdfIn PDF document text
    • http://stepka2016.xyz/29271147449s8m23.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/xixerijonisebufijoluze.pdfIn PDF document text
    • http://baltika-trans.com/what_are_seasonally_adjusted_figuresgjky9.pdfIn PDF document text
    • http://santand-es.com/90s_hit_mp3_songs_download_zip_fileysvtm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_602ad6924d6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_601123df4b39c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5ff80f885b88b.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/fadedosi/11224817237.pdfIn PDF document text
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_d71f08e6da514870a96a4db30c127027.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/primo_bottom_load_water_dispenser_hot_water_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9a1666-a507-4a64-8c14-e1988d30eb80/acer_aspire_e_15_2018_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/tasufixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3240d15a-5fc0-4982-a5d6-29f701988fc9/wefatokewikoto.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/auditing_for_beginners.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_16190037dceb47e793f80e12eb945557.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/pomunasasat.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/robert_kiyosaki_childrens_book.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_396bf9beb44a446da7d23d3c55de5fdd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 4960 bytes
SHA-256: 8f95c367c7bdabed29c7ce95d6c3479e971698e95a469a5a478164028abfea4a
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 10912 bytes
SHA-256: 79da15931e596df520e03945b36f1cd995d978611424be0f70d1ea315c2ea57f

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