Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d29c75070baf615…

MALICIOUS

PDF

78.4 KB Created: 2021-03-28 01:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91eeea83a0a471e2ff1f9b91b9903de SHA-1: 7221aab24db4314586878b496b4e44763a7eb6c3 SHA-256: 5d29c75070baf615bc56ac4e2f918c02a9853208a26a33af09d512f8e1ef3bf5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and other file-sharing services, suggesting a link farm or a distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/123?utm_term=cucamonga+peak+trail+guide
    • https://talafifu.weebly.com/uploads/1/3/4/2/134265368/29636a9678234.pdf
    • https://cdn-cms.f-static.net/uploads/4447884/normal_602f332c3ec08.pdf
    • https://boripate.weebly.com/uploads/1/3/4/5/134590871/wowowiwus.pdf
    • https://cdn-cms.f-static.net/uploads/4393485/normal_600d0924c881a.pdf
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5fe057778c295.pdf
    • https://cdn-cms.f-static.net/uploads/4472491/normal_605c6f7a05cf2.pdf
    • https://static.s123-cdn-static.com/uploads/4379374/normal_5fe46d763ed93.pdf
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/c1126cce89e.pdf
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/wexizitovos_mujodavosapogo_fulosera.pdf
    • http://kulefinimujaleg.iblogger.org/dalabonavasoxumevose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fulosobezur/the_girl_book_series.pdf
    • http://rakorexifaxokur.rf.gd/36985543337.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_8e3f434238d641dda16de0ddf642b0db.pdf?index=true
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_df9186bc0b3d470580b6420f0b052777.pdf?index=true
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_b3d521c17e2f4548b37d43e10d04dd41.pdf?index=true
    • http://zokudubogot.epizy.com/50217869155.pdf
    • https://s3.amazonaws.com/xupovobejanam/satesekon.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_3c0a3c9b1adb4855b758df691a615c2e.pdf?index=true
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_dde0301523174d9799a6f24b40a3c865.pdf?index=true
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_51a0eead07a24b80a0a8ec4fe40d4356.pdf?index=true
    • http://bimivopi.epizy.com/5148593871.pdf
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_a2945d29cb574731bddc72628ea9378f.pdf?index=true
    • https://s3.amazonaws.com/zuwosil/ahrq_guidelines_for_back_pain.pdf
    • http://pozogomeguko.epizy.com/81329508474.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_off0000f3ad.bin
bd578aa8ad664d6e83baa2588710e2d3c8b4bf05d608ede5eaf804c1b23ea49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 5184 bytes
font_01_sfnt_off0001053b.bin
b3f89e1e695d06bc637dd4571fa833ddc8e94195323fd3cf121ecdcd3856afbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 11388 bytes

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