Malicious PDF — malware analysis report

Static analysis result for SHA-256 b595fe8fd69e4d3c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 09:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da3fa6ed0efc0671587ddf7c0a643542 SHA-1: df058fac8a2875c127b71b449100f5c50fc93b7b SHA-256: b595fe8fd69e4d3cf94bc2fe2b11dbf90acf37f4b8b9c232879873c00040731e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing directly to an IP address, indicating a likely attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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 http://salwex.hu/file/nejixirifelajige.pdf In PDF document text
    • https://faguaflowers.com/images/admin/file/mefekebi.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/42334235722.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070920265102.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/futobebikirufibixogujaro.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/87259384329.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/98627060253.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/74225762588.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/mutofowakakadoxederev.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d73e02b299---57164012085.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/62440376656.pdfIn PDF document text
    • http://888chji.com/userfiles/files/48263492699.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/74554568644.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/ponafinezaxokoputirid.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/tefadudamojofuwo.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/suvupanavikupemesevalab.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42409133742.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/lusagisodegaxapuxuj.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/zumaninitenali.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/warosakoxeser.pdfPDF link annotation
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/vabivanidali.pdfIn PDF document text
    • http://cib.lin1.ca/phpsites/vertical_living/uploads/file/89172278920.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a84401d3b9---89811845753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+usb+port+typePDF 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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16868 bytes
SHA-256: 511a221aebf5942b95ce05285cf4a241f482041dfd04bc7a3512693c94ca0eea
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 10512 bytes
SHA-256: 72c3971514e19e04afe822a1538d52e171f8c37509faaa5c1c9d8a0f04b9460b