Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcd1056c3edc3f0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 01:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e8f0686516fdfd69755bf067d6d9a66f SHA-1: 215e41fabe1b344d89d5ccba3b57e7b495509c15 SHA-256: afcd1056c3edc3f0a26fd5e657392f9c523ca986bf7ff9b3fdcc3d032e9b0d56
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://ventexevent.se/uploads/file/lifetapupemam.pdf In PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/85119589843.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/xodaxokute.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0cefff1b57406e56ca9c8693422cb94b/5717196668.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/lanizozewuvowokeverinapor.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632228191.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/79914012857.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/32677705384.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lezasidegijirovemudiles.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021092565859_634934934.pdfIn PDF document text
    • https://webrobogo.hu/kepek/wofudejusunejumexanep.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/58478088373.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/dasarijapuwimusipelazug.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/35301672246.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/31410582427.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/xobuxevo.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210920162132_r70xo0.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/31800875299.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/jigomazopoturusubaso.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/75582715260.pdfIn PDF document text
    • https://signika.pl/Upload/file/wovifig.pdfIn PDF document text
    • https://serka.com/serka/upload/files/pikijinav.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/75121344890.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/gisewawuk.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/6077254386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=smackdown+vs+raw+2011+android+game+downloadPDF 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_off0000b0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 14532 bytes
SHA-256: 5920c2b16aeed5b74e089e3ba8c5754abc88c54e099243e36449deefb913c837
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 11228 bytes
SHA-256: 8152ef00b8cefc55c7f9829cfa1ed4e078589d860acc4bd6144ea2e9ede349a5
font_02_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1