Malicious PDF — malware analysis report

Static analysis result for SHA-256 71418212fe314229…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 21:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e72a4f2bcbd07b0e50c4c1969e44a668 SHA-1: 9911ce7b67ee452294904a6aacf8ea0c2677b71f SHA-256: 71418212fe3142291e75ecaf452f15d14fb5b59430190514eab87da2f0897904
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/wix?keyword=necropsia+en+ingles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445116/normal_602bb31f1cc54.pdfIn PDF document text
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/kupozidivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412583/normal_5ff8a75e7fa17.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/9537425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_60282205cc3c6.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/pagewek.pdfIn PDF document text
    • http://texivej.sportsontheweb.net/fofagaxiwir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5ff2d2e175933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491173/normal_6041bcfa657ff.pdfIn PDF document text
    • https://dipilewojariwu.weebly.com/uploads/1/3/2/8/132814651/8fbf93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5ff9df55b47a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_600fce1d57e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_601f9d04950b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_600a8e76064de.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/3539968.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/legeremutiwumejewige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_6026a17dbe9d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luropi/baa_baa_black_sheep_poem_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/mechanical_engineering_handbook_cornell.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/94286544827.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/thinking_animated_gif.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/four_times_tables_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/94959644763.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_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 5068 bytes
SHA-256: 9d12fac420d756bfcdf5287aeed86f1479528a3c7ff4a82b5f83fff1494de9db
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 10940 bytes
SHA-256: 52c75954a4f27c42bb065c7aff2835a7608e2489aa8e6c03c0f46bbdabed6fb0

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