Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2648a6c4c6784bc…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 10:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c58ae2a8731be43e476017e2e121e6ea SHA-1: 35462db6efe33e3890f15c379535f65bc4f8b377 SHA-256: c2648a6c4c6784bc247fb8eb2c5da786ba31c33b8f44df3bd1d705867522f379
74 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm on disposable hosting and containing a deceptive download button. The document body is heavily obfuscated and unreadable, but the presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=game+tembakan+terbaik+android PDF link annotation
    • http://salamino.pl/userfiles/file/debawijedod.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/22223748902.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/1245286811.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/fiworobewu.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/46395128705.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/32627180305.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/1246360609.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/dilelejitipujilugoju.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/jawinasezokimofemoweluwoj.pdfIn PDF document text
    • http://mfahk.com/upload/files/dameluxetojowometab.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909140303996238maiou.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b45f5965ffa5be86c934b742332bc64/73084749528.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/84711677883.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210919_150323.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/fepawedaxaziwoboxaraje.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wilunebiro.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109091115531755.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/fugimorefopatoxenepila.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/44260049652.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/77972357078.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903102020.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/20157133591.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/39384211888.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xisotokuseresekagisoko.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_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 17328 bytes
SHA-256: 650d772bf003529f9d8cbf3a33e39816bffa93237b3b75181395448cfde380bd
font_02_sfnt_off0001385b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 10468 bytes
SHA-256: de6a75cac66bd72206225c43ba328cb84339496e088a88d2f07ba5f863af3bbe