Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd7ec1e96c93594…

MALICIOUS

PDF

74.8 KB Created: 2021-06-11 00:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5fc54eaf8533caffcdbac6e03a9269aa SHA-1: 8871e1d9e7c20c5844e1da6a38dbee48201e789a SHA-256: 4cd7ec1e96c93594c7036ca597043413fffb723560a0da9e30ed1e68d00d79ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8952

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=tekken+6+apk+download+for+android+mobiles PDF link annotation
    • https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/bazesikoguru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_6020c27af3357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_600ff26a172da.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/ribuwesitexob.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/e2ace7bd12b012.pdfIn PDF document text
    • https://dujizozobalosu.weebly.com/uploads/1/3/4/4/134470010/dukezixap.pdfIn PDF document text
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/jelom.pdfIn PDF document text
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/5876580.pdfIn PDF document text
    • https://falomomorojed.weebly.com/uploads/1/3/1/4/131438216/7013134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_6007e556caeaa.pdfIn PDF document text
    • https://rekilobuviren.weebly.com/uploads/1/3/1/3/131380299/segupofixud.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/valufipusewume-rijezarununilaw.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/25f1eccccc23d.pdfIn PDF document text
    • https://balimalovi.weebly.com/uploads/1/3/2/7/132710770/popez_wepez_folap.pdfIn PDF document text
    • https://xobuwepowitapim.weebly.com/uploads/1/3/0/7/130775805/rulikesu_bimovalobuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501774/normal_5fed5e69da77c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_6047dbb61b32a.pdfIn PDF document text
    • https://rusokakes.weebly.com/uploads/1/3/4/0/134016884/8235134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144481305/lattice_multiplication_worksheets_3_by_2.pdfIn PDF document text
    • http://balejuw.pbworks.com/w/file/fetch/144926562/happy_birthday_hubby_cake_images_download.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 5588 bytes
SHA-256: 3870d090dda0acc7469059a762b44ac0361b7bd583038b8bfc1342405bd8735e
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10656 bytes
SHA-256: 7847f228bdc5d0f84098c84cd0ba70592527b0bb8f061841de0c140a5c7c198f

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