Malicious PDF — malware analysis report

Static analysis result for SHA-256 884cdd06fb8e3f3b…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 11:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 577f6abb2bd24713f16230fe8555feb1 SHA-1: 92863fcfcf964b5a3d0bbf1fafda352c5c72e331 SHA-256: 884cdd06fb8e3f3b71dbd7bc18d016b46bb38327b2f5fb2da101588e35553df1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to distribute or host malicious content across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://songhong-thudo.com/img/files/40510240206.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/68ab4674ceaefb817f33209ef50d6ec6/varubuvegurogutovi.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/guwipodemakalofasod.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/pubowefesamoruwinebufu.pdfIn PDF document text
    • https://vientangluc.com/upload/files/45822064844.pdfIn PDF document text
    • http://a-pluset.com/userfiles/feronomiz.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/36595262548.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/65090990286.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/xutafapamun.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/29501063934.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/fijopamo.pdfIn PDF document text
    • https://artenika.pl/fck/file/dadabiwujoj.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/25768446104.pdfIn PDF document text
    • https://magatek.com/documents/file/tefare.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/vonubipevasozago.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/negilifa.pdfIn PDF document text
    • https://jotelek.hu/files/file/1688276794.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/5690046216138b7acd2031.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/76472703527.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/98285341254.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/16047628250.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/66275976481.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8f238bee9---14095232672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+do+a+screenshot+on+samsung+s6PDF 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_off0000ac50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 15068 bytes
SHA-256: bc4bfe4f91b1e532f3e682f633dc9f63be8d0e4034c45ae23ea23cc3a2e7826e
font_02_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 11024 bytes
SHA-256: 86ecdabae21b03bd3f0dd5477d22ffcb72365b8e3daed5cc0a4129e6dc0d6fb2

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