Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd27c45fccf6b2…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 07:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 070a36ef47fc082e2c288e7c2fe0d066 SHA-1: 3ee9818b671792ca340af9a5333fec43ce85775a SHA-256: 78bd27c45fccf6b272c9f6c9c975d0a20fdaed83d72ce57e636bf148d2db418c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://archism.ru/uplcv?utm_term=story+of+my+experiments+with+truth+pdf PDF link annotation
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/vifipuvu.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/ponagola.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/vomeputofamukawogigaza.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xawutovepadoluvegi.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/nenafaxedirekowa.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/jazotarujenaxojitanex.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8ce44e46---vexurajewox.pdfIn PDF document text
    • http://bociany.sk/media/file/65728407183.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/75166196384.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/98186465348.pdfIn PDF document text
    • https://bor-diing.com/upload/files/55266192776.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/41099225994.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/99337593092.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/72782735024.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/37216234119.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/23062536300.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec44e0dc6d---bulogeruru.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jemisu.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/robuji.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/jimazaridolopogejox.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/93876996448.pdfIn PDF document text
    • https://ekransamara.ru/files/ripabibejozifasuxix.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/zobesugetunaladozoxowatiw.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/58918975442.pdfIn PDF document text
    • http://freeorden.com/media/file/54906933064.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/45654594015.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_off0000c28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 11032 bytes
SHA-256: 6913537f77298ff7b85b2cdf90978f47941a101453033e9e34f0b38ce72ba951
font_02_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 17872 bytes
SHA-256: 9291d1462d155fc56a2947606e1506cb0a4591c624eba0a82080c980ae03ddbf