Malicious PDF — malware analysis report

Static analysis result for SHA-256 e799e5afbe1aa30a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 04:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac07c13188ca7bc355f7e062e5afa289 SHA-1: dd89a2c059a911a48df6d7307ceef61eace43308 SHA-256: e799e5afbe1aa30a6cf66371934988d1e606da16c335805de8e20c5f864c950d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random and disposable URLs designed to lead users to download further malware. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack aiming to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=molecular+biology+of+the+cell+solutions+manual+pdf
    • https://warungmimpishio2.com/contents/files/tasuwojitaxiri.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/49644536199.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdf
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/35172245182.pdf
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/82347762439.pdf
    • http://inlovehuahin.com/file_media/file_image/file/fexabubanegebuvozuli.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/45925979090.pdf
    • http://mizuho-co.net/file/ck/files/72540645423.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/2603297360.pdf
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/dubolufuzajesuluvudejuf.pdf
    • http://mywymc.com/userfiles/file/98733347134.pdf
    • http://cdmvt.cz/sites/default/files/wedagokezamerawim.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136689217ffb---31524662096.pdf
    • https://eqonetech.com/upload/userfiles/files/nugar.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/21032229807.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fb87115fa6931b930ba66254018c64b/pasexizo.pdf
    • https://aashianarealty.com/file/wesuxedesogagonax.pdf
    • http://hc6999.com/userfiles/files/wobereseroxixolume.pdf
    • http://fipjp.com/userfiles/file/9924081671.pdf
    • https://atlas-consulting.ro/fckeditor/fisiere/file/fivofodelijokowukejix.pdf
    • http://autobedrijvenindex.nl/images/uploads/lolizejozomarijelofus.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/rikoj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE65 16792 bytes
font_01_sfnt_off0000d67c.bin
2f9c6448da41197c307ee0287fb5558cacc3dc0ff7c71f13dac592fd24d1c44d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 11416 bytes
font_02_sfnt_off0000f0d2.bin
0c5cde7f5fd706331c1bfd19a0b72d9df60420cdecc1e535e00bd2f44e028551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 16628 bytes

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