Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36f988b596c1229…

MALICIOUS

PDF

76.2 KB Created: 2021-03-05 14:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ccfd930caa729db534b8c67c9aabbd5c SHA-1: 66b22f78748fe3f3dc7ad8abafb375c6bccb420d SHA-256: c36f988b596c12296dcc1509cafa73fa8b25bf23f3c74a43d5ebf1262b8c9779
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains a keyword related to health, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=am+i+overweight+at+11+stone PDF link annotation
    • http://optamorem.com/146586416370us6o.pdfIn PDF document text
    • http://flowerport.store/27134228814yy8h2.pdfIn PDF document text
    • http://kostlike.site/xenitatafoew3.pdfIn PDF document text
    • http://vezdesami.ru/genakezoduge03x2n.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/nonowokavafabi_jofumimuxa_godupimagen.pdfIn PDF document text
    • http://boxidodo.22web.org/lufarubu.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/kupagojaga_pefizapelis.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/mujebig.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/64557601110.pdfIn PDF document text
    • http://cleanup-sale.site/matrix_addition_and_subtraction_workivygh.pdfIn PDF document text
    • https://jimivoxoresovi.weebly.com/uploads/1/3/4/3/134311124/sanotidenadaxabi.pdfIn PDF document text
    • http://clipshd.design/romasatefuvaro8u3s0.pdfIn PDF document text
    • http://mbfsopg.com/25685660520hp4qe.pdfIn PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/baxif.pdfIn PDF document text
    • http://domastmsk.space/33967944501ze2zj.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/364057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_2aba0cdf6edd42059efd149f255cfee3.pdf?index=trueIn PDF document text
    • http://vuruwabudakase.epizy.com/66587983644.pdfIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_7bd995b6c4244b80bc8d40da2f83f997.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/is_breath_of_snow_and_ashes.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_4b195515939f4df8bbb46f0fa24b84dd.pdf?index=trueIn 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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5260 bytes
SHA-256: 2f3c5077567042ff10d28688acc0a741fd5993b9f014edb42070293d7265cfe0
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10104 bytes
SHA-256: a805ef963a72479fb966eb327e42ca8ff98e41702f9218956c1d5e359d1655e8

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