Malicious PDF — malware analysis report

Static analysis result for SHA-256 46aeb7b026601a83…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 08:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 634d16d72f3d9950a48b7c5ac1819eb0 SHA-1: 4982a3cbdccf8bbe7ba93211624445aebf515788 SHA-256: 46aeb7b026601a8359d827622bdba29ae0f067906665dd411c136ae6ff1a176e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=radio+online+pro+apk PDF link annotation
    • http://lahma.pl/_u/userfiles/file/woganugumoparakipole.pdfIn PDF document text
    • http://gnox.vn/upload/files/fuzeposokediravile.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/11292907290.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/18994559136.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jomametonukafamejupik.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/jatut.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/69547080449.pdfIn PDF document text
    • http://yuli-china.ru/d/files/jivodugajesagerepukufotuv.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/8817252290.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/zoxalas.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/kejeje.pdfIn PDF document text
    • http://creationart.hu/files/file/ladolinukusulaj.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/jokaseradefuxip.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/kifisaruruzopadab.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/sedebalivoruwisevikezevoz.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/12483498112.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62221894357.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tulofifepal.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/16071822195.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9548f765---bakeditow.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/995645831.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tozeves.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/kuveluxelanuxodejujupa.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/49197968258.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/judafupuxuxiboluzuxeses.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_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 18636 bytes
SHA-256: e626b0743589b86cce19c0821e1d9928a0f16c22603e904a913209769670db8d
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 10256 bytes
SHA-256: 0b6b33493e664b4ac8ec49996413a8f0085dda26d77aa965a0094d53112067d1
font_02_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1