Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d2774df6f5564f…

MALICIOUS

PDF

75.9 KB Created: 2021-04-06 10:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b929cf55ef3a2d57f22669cd3cd10378 SHA-1: 9dc8689422c48b35eae05d372a8c7862bcc3e188 SHA-256: 55d2774df6f5564f18740a999fa0a87fe7472fd970ada78e4cfa1c9ccd152c52
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://golowaki.ru/strik?utm_term=prodigy+autocode+talking+blood+glucose+monitoring+meter PDF link annotation
    • https://cdn.sqhk.co/suzeboxiwo/eEhhVjf/weveziso.pdfIn PDF document text
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/5931f8c5.pdfIn PDF document text
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/9870453.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/75645943059.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/ijjh7ic/zolefawolirufovofifefida.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/value_based_education_essay_in_hindi.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/bikekobuxogik.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/jchgSje/36233578058.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/tejafad-wipavipo.pdfIn PDF document text
    • https://nalafefig.weebly.com/uploads/1/3/1/3/131379301/nuxonelufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_cbc35ed759a44ca9b6c3b1d3d5615b29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/winrar_for_pc_english_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/letter_template_address_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/82161639520.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/9093015940.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/vojufitimi.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_1163689144064d0ca8c8459d0e1c2ac5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/die_unendliche_geschichte_teil_2_im_tv_2019.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_3dbb8a45d3c84d4a87aa024f2da43e76.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_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 5564 bytes
SHA-256: 41eb1602db9bf75f2db015338a44744104c520f3fc758c07ce4134d79c18806e
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 10400 bytes
SHA-256: e3a595e1770b78e492056d99145c0f03456d6fd6bfa5316d83c033126953372f

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