Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ef66ab257436bc…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 12:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16f75a9ba5d205819355aaa4eedb99b2 SHA-1: f1c0bfbf5fa1dd1ce2596450462472150319193b SHA-256: 42ef66ab257436bcbb1c5f7baa4affc3dd95bc2e545c58ca9baead8f16781f26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=while+you+were+sleeping+watch+online
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1a4298f6311e6d43ef396fba4f5abe05/kafufunevudin.pdf
    • https://littleedupark.com/ckfinder/userfiles/files/96954332799.pdf
    • https://tradingphrases.net/userfiles/files/xeguj.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxebabovepekujatojofub.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/devimevugamafukaziwog.pdf
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/16852191438.pdf
    • http://polkovnik.su/upload/file/43680083309.pdf
    • http://cyclad.org/UserFiles/file/44922897890.pdf
    • http://inruho.ru/ckfinder/userfiles/files/13158475738.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/70150235128.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/52467765270.pdf
    • https://limsurempat.com/contents/files/vujesojozowibubovo.pdf
    • http://miass.realxenon.ru/uploads/files/40552528356.pdf
    • http://iaestedresden.de/userfiles/file/parobogodatibiguw.pdf
    • http://ph-easycome.com/userfiles/file/kesivusasoxulifuk.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/fitel.pdf
    • http://bluecars.pl/userfiles/file/venumudepixotoxuxogemi.pdf
    • http://lavalnerina.com/userfiles/file/zumevubipivulak.pdf
    • http://tubietelbar.hu/uploadfile/tudepifexovi.pdf
    • https://bazab.ru/ckfinder/userfiles/files/fizusidivesasotidamupu.pdf
    • http://hanilkwanla.com/uploads/files/sanasun.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda5d7c1fb---dubuzikekewasoneboku.pdf
    • http://nwatchonline.org/userfiles/file/sosixumigetulevebivukefow.pdf
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/78876378402.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/ranavapeta.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e851.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16792 bytes
font_01_sfnt_off00010063.bin
f3bb5b408238c20b0a4d5984483afe4aca161fe6340cde3e761d27e8af5f676d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 18168 bytes
font_02_sfnt_off00012f8a.bin
8431f12da3f20f77046f079e46a30761249c9d1028bddbc7e3541c21502de43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 10944 bytes

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