Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c5a7b1c2872173…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 15:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fdea26a47ab3c43731cb58ae7989a1f2 SHA-1: 8f59d4215f81bb1ea1a461636419b89026585760 SHA-256: f9c5a7b1c28721737ed9ad336e2aa659bed8d3272ee117179b1bc6f3f757cd5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and act as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://philabc.ru/uplcv?utm_term=legend+of+zelda+breath+of+the+wild+wii+u+iso PDF link annotation
    • http://carbonelite.ru/file/52723485309.pdfIn PDF document text
    • https://km2804.com/ckupload/files/61309509300.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/12a06998d9ef7f59a502edb7724e1963/64787895886.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131092a25828---nixodidomebukalom.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/66199157272.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/6828901888.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/pajilemibosoraj.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/1680185598.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/50591307178.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/zuxenizaku.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/53243450607.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/7532076940.pdfIn PDF document text
    • https://value.ae/userfiles/file/lisesaporamoxebokijo.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/44226851326.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/57300785722.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/nifelokematipimawakil.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/sujotewalonigajirupaxij.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/55806139374.pdfIn PDF document text
    • http://josquin-capella.de/download/16471951679.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zikefabozilatanemurubi.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/85874439089.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/jojetafupomijibunipesa.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/56758803024.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/najikutelavut.pdfIn PDF document text
    • https://lecachet.fr/docs/files/56344537180.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/13549144844.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 20048 bytes
SHA-256: 131a65a92d61951936e266307ba52cd5b24d54aa1730027a98f089140e7359ad
font_01_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 10976 bytes
SHA-256: cc8b2de2feca49818dffc838439cc546e4b650ff867c05b8fac881cd33e4275f
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1