Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0410cfbecb7c5f2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 19:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7aa7d981b4ce2c15ebef7521c395cb43 SHA-1: 5c1e5a51cfd8d53b717596f1bd7c36960daf8c44 SHA-256: c0410cfbecb7c5f26192404c95ac2e0e1917a382d30394ef1e13c0d33ae65fd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://fetogram.ir/images/upload/files/88207189853.pdf In PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/tufuged.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/38062294597.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/beguxevokoza.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/30644027906.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tijigegavatinomefekotosav.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/12002095645.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/nuvoworozugatovozebi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614371253f54d---pavafisinu.pdfIn PDF document text
    • http://slsnn.ru/content/file/pitofubisul.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/81498720155.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/69810191544.pdfIn PDF document text
    • http://52963566.com/upload/file/202109071645401617.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xisedame.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jojiwupagujofo.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/kafemevotofodadafepasaf.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/bitesugiti.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/60621751039.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/baxufilipinateju.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/87922946164.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/rubosewuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kevo+android+appPDF 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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 18056 bytes
SHA-256: 2499cee84e4d0d1a497237d985347a6822ad3a1d89c835ba139902f96d17156f
font_01_sfnt_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A07 10132 bytes
SHA-256: 2fa9e16d9557ad51b32c709b463fb6c27b58a943c57d1d03b589992bbe3bb76a

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