Malicious PDF — malware analysis report

Static analysis result for SHA-256 6181582c3c58f2f4…

MALICIOUS

PDF

66.5 KB Created: 2020-12-15 08:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d3ab2b8a9952552f18338053dbf7f3de SHA-1: c5bff70ca8ff5cb6df27d688dd4adf8cfb5fe9a6 SHA-256: 6181582c3c58f2f45c408258320074838aba8c7b5a741b386b90b4856433d8ff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafficel.ru/123?utm_term=the+ice+cream+maker+subir+chowdhury+pdf', is directly referenced. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=the+ice+cream+maker+subir+chowdhury+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fd1b7d7b9f03.pdfIn PDF document text
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/b86fbfd0a3f.pdfIn PDF document text
    • https://bizidijekivaza.weebly.com/uploads/1/3/4/5/134502856/8521368.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/gumagabu/vobuligibomegawiresa.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/business_progress_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/conjunctions_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/ascii_data_format_example.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/75144031034.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc71f15eddbb05c68937f14/t/5fcba8a0b6b7366152fd91fb/1607182496728/xejirusinuvovelomef.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/tekela.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/bien_dit_french_2_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/physics_textbook_for_senior_secondary_school.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/gafoxegogenarujivilalun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 5708 bytes
SHA-256: 5b6faef0c99dd05b18cbeb6b3a9b68677c170cdfdfbea1d15055ff251458e7dd
font_01_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10156 bytes
SHA-256: 26928f3d7fd7f88f087a2415f5b629b8e1c49d39e41a6ddf6263ccfc51b162bc

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