Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda1adf977739ecb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 23:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 045a9e139f83cbff564e3ae29dfcef48 SHA-1: 07dcab98beecc3a606ee4f1db1c90437641b44a6 SHA-256: eda1adf977739ecb802f911efefbac35097f352065784bc1800868be65c876e4
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. The PDF contains embedded JavaScript and numerous external URIs, with a significant heuristic firing indicating it's a link farm on disposable hosting. This suggests the primary purpose is to redirect users to a network of sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://acgroupenterprise.com/userfiles/file/fofirapoles.pdf In PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/72061965410.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/92488109517.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/63155449621.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/duvorukolixugetetoti.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/39276702457.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/62597335822.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/96337045272.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/22041339850.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/97031667534.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/waxixewiguzugijadepaba.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zimilaluxuvefoxizamedos.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c22c9f41---45499991453.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210907_030852.pdfIn PDF document text
    • http://hingliltd.com/userfiles/nifubijewigifidufodutib.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/53271824915.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/zebagupiweveloz.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/josikupesifinal.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/34124286275.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/25254265824.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/jidixudijofanupusogolope.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2747889c0219b5eafabe5dea9192cac0/bigomobeligem.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/77649678470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=flutter+bluetooth+iosPDF 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_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 18584 bytes
SHA-256: a003e74d69f93b95c3e6188576e851188b0eea6bbb422821110ff0ae05389638
font_02_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 10156 bytes
SHA-256: 003ccd28bc9b975cba4225c7db48cdd0e5e1d52f56de87b8c033c57a0c0b3e32

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