Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22623448c9f3631…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 19:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24c3ab5e29468894aa46e218aaa074a6 SHA-1: f7e98d7bb423e9afed08cc21f7a99ab086800992 SHA-256: a22623448c9f36318a46c3bbd1162b19c1d97c584e172c261381b374040f5699
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, some pointing to IP addresses, which is characteristic of phishing or malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a deceptive link structure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=the+millionaire+next+door+book+pdf+free+download PDF link annotation
    • https://alamansyria.com/userfiles/file/limibokunulof.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/99495585583.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/45622396200.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/23889331145.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210909_110409.pdfPDF link annotation
    • http://cokhihoangvinh.com/uploads/userfiles/file/tisigijaluvajutoxesap.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/47838972767.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/33172660810.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/54874183507.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109091434431718.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wubulitedividiwidewe.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/29113808886.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/63996379950.pdfIn PDF document text
    • http://lactopad.com/uploads/files/94401794983.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/depof.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fusufesiwo.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/zixoviwuxiderebebebugoj.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/92408947108.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/fiwaximof.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/mizesevabif.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/3887396915.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/79607097388.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/77895298096.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_off0000add9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD9 10980 bytes
SHA-256: 448ea6946f99760f150782dfddbc15c3cf189744b40ddb42848cc28a8bfc980e
font_01_sfnt_off0000c6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 15324 bytes
SHA-256: 5baf152ccbaeba641207774039c2dab65fc52799c61bfcf525245c01f867b0ce