Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c50534bba91f37…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 08:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6548c0d1475c4e9118f2ed9bfdfc65dd SHA-1: 5da268015eb477e698e81980d4a5157d1d6eca2c SHA-256: 54c50534bba91f37bf292756299cb9b2000bc6803a5029c923d0ed511fed2310
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on link farms and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=download+ppsspp+pes+2018
    • http://tingchucontrol.com/Uploadfiles/files/fejirozanu.pdf
    • http://cancunday.com/travela/img/files/livagibixopili.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/tq0l8dtdq0kqifdq1f9vvhb619/vuzegemazosus.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/33675341488.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/linevofij.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/92161701574.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/namotasipesofumimasukef.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/fajureruvoxawukolezuvog.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/54093053457.pdf
    • https://biroestarsa.hu/uploads/file/40347657789.pdf
    • http://hzqljsj.com/images/upload/File/52251039324.pdf
    • http://stphilomenaonline.org/userfiles/file/87206735117.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/13393626412.pdf
    • http://mmckno2010.zkosuchdol.info/files/mivadakodi.pdf
    • http://jandenzobv.com/image_uploads/file/jalekodanamigumuki.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapatesivij.pdf
    • https://gazeta-msp.pl/user_files/File/31636809655.pdf
    • http://aktifimmo.lu/userfiles/files/gidumafinuxuje.pdf
    • http://hagelkonzept.de/userfiles/file/vivoxik.pdf
    • http://historia-bfured.hu/userfiles/file/12504573068.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/sozijevolimiluw.pdf
    • http://proclima-membranes.ru/userfiles/file/fapebiripedomivenadikuz.pdf
    • http://alpinedelhi.com/userfiles/files/57783929092.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_off0000ddc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16792 bytes
font_01_sfnt_off0000f5d6.bin
426dd2fe1932b5355478972492ead979e6de7d4e348d5016928b4d7cf643314b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 18116 bytes
font_02_sfnt_off000124e9.bin
7605e25fbc3d0865d5b8790adb251e4288a78826894ef2d8797bf16391b2a6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 10684 bytes

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