Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69cb680d7b77cb2…

MALICIOUS

PDF

82.8 KB Created: 2021-02-28 15:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 94b5c951f2fd66dd2659b2d21eff4915 SHA-1: 2c466a871be805cddafb81fa0ac26162d5b3ef04 SHA-256: f69cb680d7b77cb212400a6cecbee50a9ab2b1d52fdf63b04c9a53001d43d85c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content through these links. No scripts were extracted, but the primary function appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://resalured.ru/wix?keyword=lg+inverter+direct+drive+7.5%252F4kg+washer+dryer+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5fe2315e76d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_601b3a64ba513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_602b8509d2160.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/penoburokud_motoxodid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_6004bc9b3bd88.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/jaxajukiwulemu.pdfIn PDF document text
    • https://novunafa.weebly.com/uploads/1/3/1/3/131379228/13933a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_603b5b3f0142d.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/49108782701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fe92b5ea4a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_601e71fdcc6d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_601723bd068b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fe6500bd7071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_5fe3b23decceb.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/ruxipabinigunun.pdfIn PDF document text
    • https://lofativunami.weebly.com/uploads/1/3/4/5/134581692/mironeguwop-lepiwewojoxepog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_5fd78eba2ef5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fc8dce79ee45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_60335f9ed5559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_601381e7d6155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 5972 bytes
SHA-256: 4fa7e8d2943abf725850e1a12868c6d35424112187a7a517d6ac035c69790ee8
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 10460 bytes
SHA-256: 88c29913cfc620b6fe4404940b9e77e7bf9748a362c766c978fe15ebfb79b2d2

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