Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7c347e729727c9…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 07:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6594b12960c7e51aea4fded11bae6482 SHA-1: 1325534f6d7abdac637141159b100a8b352b7bc5 SHA-256: 0a7c347e729727c91e41fc66711f2e97c0424a63798fda5a88baaa9d151ed007
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or spamming operation. The PDF structure and embedded links indicate an attempt to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://artetendasud.it/userfiles/files/62629460480.pdf In PDF document text
    • http://thegioituigiay.net/uploads/files/8451995924.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/bajoxijujegawow.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/30029167897.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/17765877168.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/43163646940.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/97042155133.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/mevini.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/gokofefolomoru.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/16564324234.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/tedazuxakazomujixisone.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/rifetitedan.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/salapugewukifu.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/terowuxibipiduwufukikusad.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xoworaduzowerobana.pdfIn PDF document text
    • http://strandedtattoo.info/file/kaditepi.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/tafuxonirowapo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da81e5961---64378774209.pdfIn PDF document text
    • https://redac.ch/upload/pebapewujaruwefiwibuzimo.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/fagatiwakusot.pdfIn PDF document text
    • http://aurora-c.jp/files/files/78036575901.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/34331843573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+add+picture+to+contact+on+androidPDF 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_off0000acc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 15592 bytes
SHA-256: 5eaeb6a85984151289c5b75f784544bbdc1e88e4472c349af7988419dd223081
font_02_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 10468 bytes
SHA-256: 4b94dd72a1f134e1076532d35455cc7a47e648ea4f7faebf5324e6e6731aa031