Malicious PDF — malware analysis report

Static analysis result for SHA-256 4047e5c34f106645…

MALICIOUS

PDF

74.5 KB Created: 2021-04-01 21:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3e76eeedd1b6a9f49eac1d3bd1436330 SHA-1: cc39e5a31eed489f5825da6e85f62459326020d3 SHA-256: 4047e5c34f10664543e871e59388a9ba74a4134fcc097e2885c9ec35e78d1bc9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of multiple external links and the use of disposable hosting indicate a high likelihood of malicious intent, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://baarspo.ru/123?utm_term=cesar+millan+books+pdf PDF link annotation
    • http://slmit.fun/fodalugiretimidr93ps.pdfIn PDF document text
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/4cfa495a.pdfIn PDF document text
    • http://topstop.site/jozivaguwapalnbks.pdfIn PDF document text
    • http://petersikdar.com/late_submission_of_quarterly_report_icsi2wpqp.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/zefabunobad7ebqg.pdfIn PDF document text
    • http://kdghy.online/pufapedoje80zr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464724/normal_5fff0d2a837a9.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/7175010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_60620df3a902c.pdfIn PDF document text
    • http://blaugrana.ru/46246015539zarm2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5fe936b72c40b.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/jafotufutunemides.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/never_forget_you_piano_sheetvicwk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_60651830e80d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_6025c1c8522e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d84c754-573c-49df-9800-fe9e29ae6b09/misunepijutuvesabovow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da93804-0d1b-4c2f-a25b-d583bb0af0df/wodagewinelerineni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb2a512-4610-49e6-8fb8-201e8f950f1f/92338434197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e6fd4d-8e4e-4240-b8b0-28e6071a52d8/how_to_factory_reset_ipod_nano_4th_gen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63b3748-77cf-4cf0-bf36-28909b70b990/49772448689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca79257f-10b6-4afe-ba80-de55755c73ec/mawujugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc664d45-8dda-42ce-9a67-a49c8d15e00e/is_stephen_hawking_dead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68b902e-fbac-4c84-833e-2076213ec696/girujati.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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5296 bytes
SHA-256: 6830a44322f9df91c55dd488a2937852cd4e73edba205f855615cce488157c52
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 10656 bytes
SHA-256: 363438cfaf7fe7606cf18e1e760a4394249a538522a98d4b5ae8e2fe91a0acb6