Malicious PDF — malware analysis report

Static analysis result for SHA-256 1112e7a14951c42f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 15:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b6a010143647465b6a255c99fcffd4e SHA-1: 88cff5adc9b887ce8dd346c379698d5a6c432cec SHA-256: 1112e7a14951c42f3b956f8ead82877828be9866740cc7fc75acc1154c6d11ce
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on diverse domains. This behavior is characteristic of a link farm designed to obscure the ultimate destination or to distribute multiple malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://superazs.ru/images/news/file/beligow.pdf In PDF document text
    • http://thephinhmienbac.com/upload/files/20031404969.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/vexinenarare.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/2451767021.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b956f1cf41---zigapabipazesuwusiwuw.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/xedonakibunanaj.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/kazinitoxafifizazawud.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/nivujizena.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/crk5ka6er4044dc8qbiirjq2fd/tibonuni.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/girulisanadeduxurer.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/tonoxenogasesisuzoze.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/13670268957.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubotuzajekibabelojamoj.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/27100823831.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/pulowuxorosijof.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/jiboxesegevufof.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/janifuzuger.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/84966320399.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/rabukezi.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/96834626612.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/29548011765.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/fujuxepegokumaxemimase.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/8109328411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=time+event+samplingPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 18828 bytes
SHA-256: 580a1d82608d04ab0b42da629ad7c8b1e6fd06517fdeea120ffa75b660cd8caa
font_01_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 10404 bytes
SHA-256: fa38876bebd8275f6fc7da386cdc417afe1b87dde4e19e9e16aff358d3cea225