Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4164a795c4214bd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 14:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12f57637a2b94075a8d3507e5b7b1e4e SHA-1: 0368261922feaa9e6a4227f42778be1273730676 SHA-256: a4164a795c4214bdd9fee14a1f5d8c73ed707076d38f825477d8e46abcfdd18e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://protrialse.eu/files/files/60791313765.pdf In PDF document text
    • http://indianspringhomes.net/userfiles/files/35914298715.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/vevivetagilelagewonavu.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909150456627049gy9mn.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/97386549775.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/nuvegegupitapuk.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/79122567482.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282877060d---zubibas.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lurun.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210831163044993028.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rinojasaga.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/gaxixarenu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/30280168579.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/59964728073.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/53737711555.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/45503b19b262a7a8b8fb78b945f552b2/51208326369.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/32583691085.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/zujowaresuviku.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wegebizagofat.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/51979034512.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/lobazukatipumevajedap.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vudirezudisozosipat.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/wipidurumoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=number+of+composite+numbers+from+1+to+100PDF 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_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 10824 bytes
SHA-256: 32e2ce4b0b272acb170fd86e9275dd36a439df9a644ffbfc3ead1b23b7a10526
font_01_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 16808 bytes
SHA-256: 34f824d77c081f0768846961a76736d9529a94b862821441959e3da806b7ceb8
font_02_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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