Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b4f648fcde2846…

MALICIOUS

PDF

77.9 KB Created: 2021-03-29 11:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf7e9e6ee937ad51cc4bcda3aa9c5606 SHA-1: 6434d247553bd73cf9208598456be818a5a346ff SHA-256: 65b4f648fcde2846d18805f5b8efe4783cadc2a2d36539284902352ce833891a
214 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to suspicious domains and are indicative of a link farm or phishing campaign. One critical heuristic specifically flags the PDF as a redirector link to known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=when+will+shadow+and+bone+be+released+on+netflix In PDF document text
    • http://thailandlove.site/minecraft_download_free_pcdm03c.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/pulawigususa_toxodupo.pdfIn PDF document text
    • http://naturalm.space/difesumasivabibatuvexirop80zek.pdfIn PDF document text
    • http://nubatevujonuw.mygamesonline.org/9358857533.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/9678362.pdfIn PDF document text
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/pomupo.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/786903.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/9709711614.pdfIn PDF document text
    • http://alexandreablog.com/4374997449tfk0s.pdfIn PDF document text
    • https://bumudipokipilu.weebly.com/uploads/1/3/4/3/134350227/5fd180e.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/xoviberibinifos.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/guwufagiwetuk-tosewusenepiwat.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/gurerili_jonesud_febaxujoluzud_ruzowibox.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/mujesogi/school_website_templates_using_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/adjective_of_quantity_worksheet.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_a2387981f9e34a23a313d1f002c5fba1.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_53ceb9f1897a47a29cc12508aec33154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/mekafazudalarajisega.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/sir_anticoagulation_guidelines_2018.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_7b26135bfb25439989829b97b88bcc42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/wd_tv_media_player_specs.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_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 5308 bytes
SHA-256: 314fe943b3423c74804b41a8c9b55c75676b9552da5815bafd3d33596d0f5a55
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 11072 bytes
SHA-256: 34063f9c89cefcede31077a5dc2253daf133e92007cbdb0869fe2a3d9e1355e1

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