Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c4b3a94fbd08c9…

MALICIOUS

PDF

92.2 KB Created: 2021-09-19 17:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 303e8cf16af74fc6650470a2b0d4fe09 SHA-1: 6b674e7873d70f2537bbe4e58ec649895d26e7a8 SHA-256: e2c4b3a94fbd08c9602a5dc02aa18bb14f76bf5be531ebc3a859705549553eb6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fonnepal.org/userfiles/file/bonemigorefulute.pdf
    • http://eot.mn/uploads/userfiles/files/fezipezefusedosidogatel.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/29133070000.pdf
    • http://mega-treid.com/userfiles/files/zusodaxanozomupuleremino.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/57701912851.pdf
    • http://toroisg.com/public/images/files/zuzulefukemujiku.pdf
    • http://yuilchem.com/userData/board/file/81699169433.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1kd25rv442uabvn78nbtbldp2/puzofojofijipuzafuges.pdf
    • http://cementfeet.com/userfiles/file/27788529527.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/rupoxelizutipakowedise.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p9bdcchl0q3d049ftboomk3vi3/38206903509.pdf
    • https://uclerbaklava.com/resources/file/kixapat.pdf
    • https://sieuthimaytinhcu.vn/upload/files/96658102290.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/pawotuxomiwakewos.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/kenimavezusuwunugizet.pdf
    • http://haraj-alqunfudhah.com/userfiles/file/rugakugalopizifikotexunow.pdf
    • http://tdvvietnam.vn/webroot/img/files/40273167971.pdf
    • http://terezmisszio.eu/files/file/waxumesegof.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/bejefajuzuruzonuw.pdf
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/werizo.pdf
    • https://ocw.tw/uploads/files/37649305633.pdf
    • http://speckletrack.com/update/editor/file/94160611084.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/73696797036.pdf
    • http://springgalleryng.com/Images_upload/files/67487561998.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=onde+fica+a+lixeira+do+samsung+galaxy
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 16792 bytes
font_01_sfnt_off0000fc3b.bin
eba7131fc9d4da5775d33ef8d0c315487ae2655e2852d2696f1b65243463af2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 17696 bytes
font_02_sfnt_off00012a52.bin
2622536b8de06751383c0f312a05ba32e80c97a3d36f3060294709d391172a8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 11060 bytes
font_03_sfnt_off000143e6.bin
5bae52006e3f3ac50d0dd35760d51b4a5bf8997038aca2d7548284ae62eb996a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143E6 18968 bytes

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