Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c92e42ac7a84ce…

MALICIOUS

PDF

71.6 KB Created: 2021-06-06 15:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a2d632adcb8d27117c11b9e37ffa5dba SHA-1: 142b085c5140340729b9d5ef278891610a63f43e SHA-256: e8c92e42ac7a84cefa311e46aae5791e3a0fad00058469626b76310a1e1908b4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying the suspicious link distribution. The embedded URLs likely lead to phishing content or further malicious downloads.

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://irlanc.ru/pbw?utm_term=how+to+find+x+formula PDF link annotation
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/7ca36e1dd4f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374852/normal_60b1f15a54008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_601f1b6950e88.pdfIn PDF document text
    • https://didunebufanef.weebly.com/uploads/1/3/4/6/134680758/xexexakanum_potiz.pdfIn PDF document text
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/7f3457.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/fopogexuwivug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_606bd6c86b1ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476301/normal_5fcbcb085b8b5.pdfIn PDF document text
    • https://xijanejomasug.weebly.com/uploads/1/3/4/5/134506458/dagetupazivoputo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_6028aae347bff.pdfIn PDF document text
    • https://famipitep.weebly.com/uploads/1/3/4/3/134355151/2826b6cf.pdfIn PDF document text
    • https://suzilevovovo.weebly.com/uploads/1/3/4/3/134310132/f364b4476188e17.pdfIn PDF document text
    • https://lenalavawin.weebly.com/uploads/1/3/4/7/134732275/fuzetapifagobalaboj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ff67fe0841b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_60bc5ce69d012.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/3c27e96c-1413-48e5-a161-31f98effe605/48124383040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61c6fdc-70cb-441c-863d-7cd3c4ada0c6/mapizobolepamemakegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0125ad-3400-4368-829b-06bcd1589db8/wasad.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_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 4996 bytes
SHA-256: b127b4761f5b5d60258b269166c0564c17c861de14f33f1756a83337e4d8d467
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 11360 bytes
SHA-256: db43a214c286b42383eea341579e69209952d2da127640b9a1831862fc155f82

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