Malicious PDF — malware analysis report

Static analysis result for SHA-256 1911905f241b6da8…

MALICIOUS

PDF

77.6 KB Created: 2021-06-04 04:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa430c6dc2de6d72c02a279e4f55ed62 SHA-1: 7208bf7988836011ddb3d9e44be2388d8abeaa88 SHA-256: 1911905f241b6da85b401382790d6de438c35335204c5df16cc468bdce23d120
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs, including one that appears to be a lure for 'lords mobile hero stages guide chapter 7', points towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=lords+mobile+hero+stages+guide+chapter+7
    • https://cdn-cms.f-static.net/uploads/4426261/normal_600b01646c21a.pdf
    • https://cdn-cms.f-static.net/uploads/4412607/normal_5fd934ec516dc.pdf
    • https://mafidusat.weebly.com/uploads/1/3/4/1/134109097/7809409.pdf
    • https://ruwaxejitoxa.weebly.com/uploads/1/3/4/9/134902813/jurazibose-dodeguwas-mopekexodegu.pdf
    • https://cdn-cms.f-static.net/uploads/4383566/normal_604a3fc4396a0.pdf
    • https://ramujodavuratot.weebly.com/uploads/1/3/4/6/134667495/8dd926d378.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/526a7141-3d0a-4b54-861d-57da12ccf21d/do_vegetables_count_as_carbs.pdf
    • http://mapaduzipi.pbworks.com/f/taxigove.pdf
    • http://xuruzinijub.pbworks.com/f/om_shanti_oshana_full_movie_with_english_subtitles_watch_online_free.pdf
    • http://mutoteja.pbworks.com/w/file/fetch/144523227/can_i_have_wine_while_taking_phentermine.pdf
    • https://uploads.strikinglycdn.com/files/bbc0e1cf-162e-482e-8bbd-b3e8e4dcf213/86530759399.pdf
    • https://uploads.strikinglycdn.com/files/8ec29669-a773-4854-80c7-f8fa77ebebd0/what_is_neuropsychological_test_in_psychology.pdf
    • https://uploads.strikinglycdn.com/files/46902c34-74ba-413e-a27b-1291b5d97a5c/what_is_the_term_straw_man_mean.pdf
    • http://xutosop.pbworks.com/f/87304424230.pdf
    • https://uploads.strikinglycdn.com/files/bed967b6-ae2b-40da-b2e6-e85e692b980e/western_digital_my_cloud_ex2_ultra_8tb_test.pdf
    • https://uploads.strikinglycdn.com/files/24c00c5c-e5d7-4501-9c2b-035d3da8c170/46556465148.pdf
    • https://uploads.strikinglycdn.com/files/e5587189-0ca4-4902-b268-690e7a35bd3d/hpi_baja_5b_ss.pdf
    • http://mogulazedub.pbworks.com/w/file/fetch/144525618/bail_application_format_under_section_436.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_off0000f03d.bin
0ff029f873b9994801c4bd96c6a3852c033d3acf3940f39a4a4dd2a8617bab10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 5648 bytes
font_01_sfnt_off00010345.bin
bd6419124c3703e661d3d537d3fa02a9bb6327c00ff4582cc0cf30625ddae860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10644 bytes

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