Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f9c31bf0e8d48d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 04:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 426eaa590bcfe47f1239d6eb226b878f SHA-1: 627fc05884add7dddec7ca213dbd9710da67321f SHA-256: 30f9c31bf0e8d48dafd6d6a895a9f76c3ccf0e4e66951fbf6f1be167d39f6f2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://svazekobciorlice.cz/userfiles/file/92332963546.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137892935ee5---moxudibagujevuv.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/36764772916.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/sumux.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/29077910719.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/82027502410.pdfIn PDF document text
    • http://usateatop.com/_upload/files/lukigipobifana.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/gonatuvevejafidixu.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/74847481857.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/gitufivakawes.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/viboxomasolagik.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/givipogovasasir.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/bakirawarer.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/8681001203.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/ninawezafulikibofan.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/darebudeduwut.pdfIn PDF document text
    • http://teifsepahan.com/files/file/39875948191.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/tuwadilenotozomarul.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/kexujurofivasuz.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210901115441.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/13901356060.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/71739538331.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/wupojikomutujapolirup.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/071951404090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=canon+in+d+cello+soloPDF 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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 17768 bytes
SHA-256: f924924f386d683ac3d9a1a26d71c01c5ce6d5200f92b2068d6c2b7adf5a75bf
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 10196 bytes
SHA-256: 8641dd1008b6a530f6bb53b443209c354a7662e480a2edd87c8480bfdbf054a1

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