Malicious PDF — malware analysis report

Static analysis result for SHA-256 42558cfb6584079c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 07:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7e2c51bddc29801dd95add84cee55fc SHA-1: ae19f9730cafbd49ff6610873aaacfafdcb96164 SHA-256: 42558cfb6584079c4466ddc0d0a9bf040b42675c3b48e37a94f0165d413a3a41
74 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by numerous external URLs and a heuristic identifying it as a link farm on disposable hosting. The presence of a 'download button' lure further suggests a phishing or social engineering attempt to trick the user into downloading a payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=gabriel%27s+rapture+pdf+download PDF link annotation
    • http://fishngrill.iorderfoods.com/uploads/files/70355744254.pdfIn PDF document text
    • https://nada70.org/userfiles/file/fafowesunafabatodojeve.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/26914768288.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/67983800772.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/67758189183.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/080309506246.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6969932c1e8f9a1991d0db01c2da6544/16859986807.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/vojapadelevugemupodibog.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4f49c34c---82408518122.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/85432517865.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/75607524751.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/35316804154.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/zetafox.pdfIn PDF document text
    • http://robbes.nl/media/files/fufejalana.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/tanamone.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/10513853134.pdfIn PDF document text
    • https://aromamarketing.md/img/files/vevaritonizaxeg.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/61461386263.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/vekezexetumekuziwi.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/nejakaliv.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/58808681530.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/94900763047.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_off0000b6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 10888 bytes
SHA-256: d7542ea6d285a7881c32fa096ca3dd6b9227b9eafba73e3a0d4aec84b92a9a00
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 20204 bytes
SHA-256: 557a12da76fd1e47863a3f16d0b308c8822b35422c83e4949909fa2f31f9186a