Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf797c2f478c7acc…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 19:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 758182e0a018b96351e9904b3f3c1260 SHA-1: 53f11d5b7db8c2bd8d79431fbc9b17656d57479b SHA-256: bf797c2f478c7acc0f16c69abb9780e15b63486fffd5797466f2693cea7599c7
244 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or scam campaign, leveraging a misleading document title to obscure its true purpose. It contains a large number of embedded links, with at least one identified as a malicious redirector. The presence of a link farm and disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=who+died+13+reasons+why+season+4 In PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/396e799a03f64.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/tinaxugumuf-darilegezamor-jaduxame.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/91153456736.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/86869472057.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/9667923.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/mogavozu-zujidu-zevigupi.pdfIn PDF document text
    • https://belawutuvuzepim.weebly.com/uploads/1/3/4/6/134605506/kulalixekus-deragixafibim-talamilopufi-bavarux.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/731213af.pdfIn PDF document text
    • https://zojezuma.weebly.com/uploads/1/3/1/3/131382028/ac9b3.pdfIn PDF document text
    • https://lefofikik.weebly.com/uploads/1/3/5/3/135316562/logofurijegoma.pdfIn PDF document text
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/rudipe-jipamanunubu-jorememubeb-kosowejonegi.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/87887b03f.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/mijutiro.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/sivef.pdfIn PDF document text
    • https://fekujerixotose.weebly.com/uploads/1/3/4/8/134896765/8b911796f9b46.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/01ae1e2ad97be.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/zaxefemebidaz/lixofebaxojuxizajubozupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f0e1f9-6f65-4c05-adf1-dc27d3a8d02c/how_do_you_find_probability_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a8800b-af44-4acf-b2a6-39d22965fb4b/93204599897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ea100a-2f5a-45b2-8ffb-d7dc51664108/how_to_calculate_inflation_adjusted_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/bts_lie_piano_sheet_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8693c7b-32eb-421a-bbca-8fc57e469ca1/quem_paga_imposto_de_renda_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/botufibajagupazunenulox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94bd68c3-32c5-4def-8b1a-a745997c7317/mileg.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_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 5392 bytes
SHA-256: c6759e955f5a02dabc1ffd4c7f32b6606f5950d7e1e14a5e8d4ddaf54b4bf967
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 10580 bytes
SHA-256: 83817a6b26122712b5f943985467404c04185b369b0bf8165fcda4545e367d05

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