Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d839a58c8cdd4…

MALICIOUS

PDF

92.9 KB Created: 2021-06-07 07:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de674b448300f1bbd0e988571b5bb42 SHA-1: d5b5e61273b801117ad04984369045cfe150c854 SHA-256: a90d839a58c8cdd43c8d468df548e5bcf0e75c85602482382b85ca9769ea3774
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The presence of 'Clash royale api' in the document body and a suspicious URL indicates a lure to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/123?utm_term=clash+royale+api
    • https://savigopomela.weebly.com/uploads/1/3/4/8/134886046/a333eae6e.pdf
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6035d8dd60295.pdf
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/9030434.pdf
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/6960466.pdf
    • https://vewawuwidavejo.weebly.com/uploads/1/3/4/4/134403009/2092935.pdf
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/zosisebigava.pdf
    • https://vomakitiba.weebly.com/uploads/1/3/1/3/131384058/faposutureg-kakevopatuv.pdf
    • https://sitasujo.weebly.com/uploads/1/3/4/8/134876827/letesexa.pdf
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fee521eef2bd.pdf
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/vamopaga-sidalaf-xasulofosiz.pdf
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5fe0421f95957.pdf
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6060955b0523b.pdf
    • https://ferijadupegol.weebly.com/uploads/1/3/4/7/134705138/bd3b5f7328.pdf
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe0671431a75.pdf
    • https://mejidoxele.weebly.com/uploads/1/3/4/3/134320803/ed2ccdcf1aa56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63d305be-261c-4758-9441-f4821dbcc254/dragon_ball_z_rpg_character_sheet.pdf
    • https://uploads.strikinglycdn.com/files/05f60ffc-6e0b-44a7-9ab9-5c14d0ac35c6/dork_diaries_movie_trailer_2016.pdf
    • https://uploads.strikinglycdn.com/files/d88dcdf0-bc9d-447b-991f-8099fc391fdb/short_story_structure_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/269610c1-189d-4416-821c-61ffb0527ea1/ocr_a_level_chemistry_past_papers_2016.pdf
    • https://uploads.strikinglycdn.com/files/fdbc3d6a-a640-47f4-bf93-c19afb59bdbc/19640327050.pdf
    • https://uploads.strikinglycdn.com/files/1d17475d-f2ad-4e21-a452-793725a9b7e2/android_mobile_repairing_books_in_urdu_free.pdf
    • https://uploads.strikinglycdn.com/files/f0101380-6f81-4e72-bbb0-ed90ceedafab/aplicaciones_para_aprender_ingles_gratis_para_apple.pdf
    • https://uploads.strikinglycdn.com/files/316cc3d0-a1ac-46a0-9c0c-478603d8f788/difference_between_per_capita_income_and_average_income.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
    • 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_off00011b2c.bin
61fef3be3feb697a1abdfe91488f5adb3d95a8e8d894f722682119cb94a48fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 4916 bytes
font_01_sfnt_off00012bdb.bin
d2268a5bacc632e1d09986a8efc7fed7dfcae74f5737fdd62a4f356f23460995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 10824 bytes
font_02_sfnt_off0001511d.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1511D 16204 bytes

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