Malicious PDF — malware analysis report

Static analysis result for SHA-256 a136da43c419ce5e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 18:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 431e25f97725731f811d2d181380ed58 SHA-1: ffae00d807f3ab07761f5bd713aab23b2cfed001 SHA-256: a136da43c419ce5e69fdaaaf15237e6b068d6ef836f93461a54d2b15aa72888a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt.

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 https://pixomot.ru/uplcv?utm_term=watch+atomic+blonde+123movies PDF link annotation
    • https://sklep-pinokio.pl/web/uploads/files/gexujebegusosemok.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/42949464267.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/848e86e06e192fa610e00e8a01a575bb/30335012426.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/vafozekafej.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/muzijozepeda.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/97086494394.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/62272003800.pdfIn PDF document text
    • http://mgrima.com/files/file/19713271282.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/navoliromarataxe.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/81653229478.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xexumofipomawu.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/suremibuwazeroxomediluf.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jabotagi.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/57305414948.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0b336c5d---33408698564.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/xakabo.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/dubibezeru.pdfIn PDF document text
    • http://xfswchem.com/upload/files/53914686106.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/dipolikaxo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/tilup.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/nasewijibogi.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wawukukobavubadatojem.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/19571340039.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/12647542816.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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 11080 bytes
SHA-256: cefa95956abdab38b02fcf72dbc243e91cb53aadef802ee0e28ef1485e1adc21
font_02_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 18660 bytes
SHA-256: b63a7f44effbd3621e1e74b88046f68bae588322a581623355611b1cbffccd7d