Malicious PDF — malware analysis report

Static analysis result for SHA-256 658033b260f89edd…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 00:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98f5c1b39fa80659d5eaeeb2eac69484 SHA-1: 19c48d4bae1ff3c677203d4145d821b4fa1e0dd1 SHA-256: 658033b260f89eddb9b097d91ff96033f9162b6ad6e7b5fd06a5a4aaae9490a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm designed to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hotel-ambassador-nice.com/upload/files/rageba.pdf In PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/22932927566.pdfIn PDF document text
    • http://17njl.com/userfiles/files/zirix.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/89659942791.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zodulokajukikaropaxuzasod.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/zudejifozejaluk.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a901a6968---47371579191.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/100353b9b4731a29bb9597b24e00d08e/narelixivo.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/komurapiporijamagenujuva.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/metifosunu.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/43063656419.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/54351537014.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/86255515659.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/bogorobotusego.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/99684958300.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210903005259_j2ibm8.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/73378950887.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/46286718342.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/42039161720.pdfIn PDF document text
    • https://tierlistei.ch/downloads/96867767898.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/zifejirofofer.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/majozalufibe.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/nulefogipibiravibuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=windows+7+ultimate+diskPDF 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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 16060 bytes
SHA-256: 9df4799bd7922003752d783422aacbc39304f02fbdf1a8f9f26daa5d2cecb160
font_01_sfnt_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 10628 bytes
SHA-256: 4e258e983dd962d56cc057683ed819439530b825c8271a98133cdcf7a92cb663
font_02_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1