Malicious PDF — malware analysis report

Static analysis result for SHA-256 10df856500780e36…

MALICIOUS

PDF

77.9 KB Created: 2021-02-04 15:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 69e79b47c0f3942e05a6bd802c16199f SHA-1: 6196daa39d44311973d17917cdad0a51378d56f5 SHA-256: 10df856500780e36005936b06015fb783625bc42b111ac0b0c8f903bafb45881
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. This suggests a link farm or a distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/aws?utm_term=cpca+dispatcher+test+study+guide PDF link annotation
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/jenixarenudof_baboduluvuzal_fuvexevizewib.pdfIn PDF document text
    • http://ketosimple.online/vogalabokinuvotodabolocjmnm.pdfIn PDF document text
    • http://wersita.fun/ratoxewod2ps2y.pdfIn PDF document text
    • http://zebrait.fun/sims_4_autism_modjya3h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491926/normal_5fe5c189da711.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/Lhfibxi/vifogese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5fdde731ceb61.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/jazobexutusoboe7jp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369149/normal_5fc64376c2386.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/4403366.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/3551542.pdfIn PDF document text
    • https://lopenedaxi.weebly.com/uploads/1/3/1/6/131606218/gusizowizokiw.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/tepenutatuw-xowulexutexanap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_60081d0c9b764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5fe342d050fe0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 5096 bytes
SHA-256: 29b362cca9a8f7bcfda81e675e5af5d23f4a487e5147d082fcd350cc3f450f13
font_02_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 11232 bytes
SHA-256: 7725162faf76742feb3d30cee57905560c920a811690213cd12b13135254ad2e
font_03_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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