Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0944ab49317b49…

MALICIOUS

PDF

76.5 KB Created: 2021-03-06 08:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ef6c1ec4f7d9ef707b3f1678d53ec95 SHA-1: e89420c834452e443dc8425bae1286170f88cc3d SHA-256: 5a0944ab49317b49e7317b31aa1608a5b2d942fb1b6c464300e73cf030420e69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. While the document body is heavily obfuscated, the presence of numerous external links suggests a phishing or malicious redirection attempt, possibly related to SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=reading+guide+questions+to+kill+a+mockingbird
    • http://rosebip.22web.org/how_to_connect_lg_sound_bar_with_hdmi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizakokowe/delete_mdmp_files.pdf
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_20460bfb29204b87b19dce7724e610ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/885368fc-2612-41e0-aec2-791aa3e368f7/wipakasetedez.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_5882c0ceac4d4c6eb840448e51374c27.pdf?index=true
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_208858decf5c4137a24f4ab98b757047.pdf?index=true
    • http://vibesiwag.epizy.com/the_great_gilly_hopkins_book_reading_level.pdf
    • https://s3.amazonaws.com/wovigebi/pruebas_liberadas_ser_bachiller.pdf
    • https://s3.amazonaws.com/sepawi/complex_calculations_in_excel_sheet.pdf
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_1e8e73eceb4642ad983e252f8cdc4a2e.pdf?index=true
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_03de9323ac934e5d99eb56150acb7cb0.pdf?index=true
    • https://s3.amazonaws.com/ruzaganog/77291380212.pdf
    • https://uploads.strikinglycdn.com/files/4cf529fc-8108-4d4e-9742-db66ad5b0e5a/sulewopepekubawor.pdf
    • https://s3.amazonaws.com/jijari/daginigelerelananuxatapi.pdf
    • https://s3.amazonaws.com/gatazeromij/mikitavonugotivetejidiwi.pdf
    • https://s3.amazonaws.com/bupijila/dragon_ball_z_super_game_apk.pdf
    • http://purubonosarule.rf.gd/76819337249.pdf
    • https://s3.amazonaws.com/fuwawibu/64207705729.pdf
    • https://s3.amazonaws.com/bodajaku/45992754860.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea5.bin
d4f10d9c6a3e1e70c0cf6033d0d2f0ca8ef79c805f79fb5af3142ab545547508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 5596 bytes
font_01_sfnt_off0001019a.bin
b1ff54f5832007253a95196f6424a4f1700a6b035d21976e35c9647fb4b531c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10184 bytes

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