Malicious PDF — malware analysis report

Static analysis result for SHA-256 56655bed05180bc1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 17:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b28ac89b7af19e895fdbdda9c2199dbf SHA-1: 737ede4abf2583ff75b6ae971c9e491fa38358e5 SHA-256: 56655bed05180bc1be920ee24bbc1c935cb5bd4bdff06514079263bed4cdbebe
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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/uplcv?utm_term=how+to+check+if+someone+viewed+your+instagram+profile PDF link annotation
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/10267111926.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/giradipowujaxo.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/nilusoramazufafun.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/41176332247.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/nevipevavaxodafik.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/nokopagobizakidezuseva.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210902_A0F722B9C6DC75E0.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312fa7a7036---85429416277.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/nowaxetan.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/62977179710.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210905_31A3C135487298B3.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/1240876307.pdfIn PDF document text
    • https://invision.buzyhub.com/files/xowuzudiralozejaz.pdfIn PDF document text
    • http://nktrading.qa/file/files/96044548747.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/fanedodepupo.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/bodugesitisunipope.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kedonazuletirosafo.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/46825950901.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210915094836.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/39423277746.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/wifuvudabakoliwatagulon.pdfIn PDF document text
    • https://producto.works/userfiles/file/836176366.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://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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 18372 bytes
SHA-256: a4a0e0f6c2894b65fb15aa5d58a6ad29e6a63ff4a5360eb0a8c2a1a705d28510
font_02_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 11516 bytes
SHA-256: a5521b8a9fa1800f6dee82bfba168eaabbbdc9ca5e0f1bb791968a110c8d058c

Open this report in the interactive analyzer, or submit your own file for analysis.