Malicious PDF — malware analysis report

Static analysis result for SHA-256 816de26ae7c0ddfe…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 02:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f43011180b511f03d44c6feced9d4ca SHA-1: ebdbf59c370428a672599af746bd1b0e2b4982c6 SHA-256: 816de26ae7c0ddfe53fe9bc8620056cdbf0ce73b650a3764ca37c052db920486
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=general+formula+of+ethanol PDF link annotation
    • http://silver.jo/ckfinder/blanc/files/14341993029.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/56950674364.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/86949717571.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614506aed81c4---38969622202.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/84242553845.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/28333009521.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/58959366064.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wilerusafosedis.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/9288297021.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/nuselozama.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/40754259921.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/gonuvolarinivipoziwus.pdfIn PDF document text
    • http://delve-cr.com/uploads/70019589082.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/97888684334.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/zenuxavusuveworarul.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391caca2eb2---loboxezavufijomi.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-18/20210918141037534941.pdfIn PDF document text
    • https://remini.hu/userfiles/file/55227234226.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/xunowaleladuj.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/gefuzeduxep.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/muxaborenimawowof.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/povofinavoje.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/gekij.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/51299159579.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10360 bytes
SHA-256: 8091950bc3f4cb60428c87df0dbaca26cfafbe35f4045d486baca8a40b6f8359
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 17736 bytes
SHA-256: ba200f108a7fe6176bd78ec0ab0d55f8856fdde6f6db3178507a230bab1d2415
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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