Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ad704987411aa4…

MALICIOUS

PDF

67.8 KB Created: 2021-09-16 13:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 308c7874c49455d2114317f9420d4fd1 SHA-1: a5030c94292b2873325d31de55df0c0c62ca358c SHA-256: 13ad704987411aa46e12652ff25a0fbda538f9d3015c4952a2da92b693b5ec86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to distribute further malware or lead to phishing sites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=android+password+removal+download PDF link annotation
    • http://hondaototanan.com/upload/files/25734785843.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/54960353260.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/97663746826.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/92518580651.pdfIn PDF document text
    • http://ausafe.net/images/art/files/79084877111.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xewologamazikopumox.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/48617047785.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/18612027074.pdfIn PDF document text
    • https://shibbirs.com/media/files/mesaxen.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/43170218174.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/dakurobimonutoberofuwiv.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/66039296486.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/45d7d9c78ed163e6db77fa49fe15e69a/38558874309.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/molawirevuxuzamejodenuma.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/ziles.pdfIn PDF document text
    • https://finliz.lt/i/File/34674613232.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/54618244542.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/70560490493.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/8144932666.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613594b048af5---8005123600.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/lanizozewuvowokeverinapor.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/13691058693.pdfIn PDF document text
    • https://durimawar.com/contents/files/81979501381.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/povemopanukatenapexaximar.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_off0000ae39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE39 10588 bytes
SHA-256: d15ab3dc08152c3505f17e38d297d9929888c4e1628ec7f8539dc29e248ddf31
font_01_sfnt_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 14348 bytes
SHA-256: b3734daf2946618dea7b4e20a0fb0eade1582093d4700f69e67a08a6488314b9

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