Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf705c01e9e6dd5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-14 09:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 280daf5a058a9b5ec3640bd0c5b1ca1c SHA-1: aa984892ee350693035306ea39bf82f275f8d3d6 SHA-256: fcf705c01e9e6dd5af1d7b170092732025ccfbe3643c07bd9fcb5561330d3a58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=black+friday+smartphone+deals+uk PDF link annotation
    • http://studiotecnicofrisoli.com/userfiles/files/midipupatogomexeripoxefu.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lepepiwixa.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/gitelixizi.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wuponurobezimoxif.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/4719519226.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/27661111094.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/68926406235.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05484be62---72390666393.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/nufivukalidexezex.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/51681001622.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/90688556762.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/talotezopijojizalir.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/92710206771.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/lexejagepexow.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/sekekojomi.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/49596034461.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/zusepos.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zilunaxap.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/45371340596.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/kelixagodomeremidafav.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/556de0f65f334d6c2797fc41eef1e5f8/46727920541.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/47812292538.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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 15036 bytes
SHA-256: 4a8cef65563dad120b553972a6aa67438652d738f1fd711dbfbe6ff9241bf06f
font_02_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 11244 bytes
SHA-256: a1312cd58d0c36d1d046336e19404ed9b7e8ac3fe61e69408c9c12d09f31180b

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