Malicious PDF — malware analysis report

Static analysis result for SHA-256 4212c4d5d83849f8…

MALICIOUS

PDF

70.1 KB Created: 2021-03-25 14:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d01acd7445aa5d953333f7df663462c5 SHA-1: d864d2337264bb6fa9a36e259729e7698ed2024a SHA-256: 4212c4d5d83849f8361ab8a8b8f90ed46209be15a00205729a10290caaaac90c
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 as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary technique likely being Spearphishing Attachment if this PDF was delivered via email. No scripts were extracted, but the presence of numerous external URLs points to a content-luring or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ponafet.ru/strik?utm_term=team+abilities+heroclix+marvel
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/robobedovupufitozi.pdf
    • https://vovazukaliwo.weebly.com/uploads/1/3/5/9/135962855/689300.pdf
    • http://alkim.xyz/yearly_planner_template_excelh0asm.pdf
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/0304ace863af.pdf
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/9072460a6e88.pdf
    • http://idealica-italiaufficiale.site/5855778560179koj.pdf
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/zotadesuti.pdf
    • http://yatvoyya.fun/examen_planea_2017_respuestas_media_superiorfzfc3.pdf
    • https://teraxawazolazov.weebly.com/uploads/1/3/4/3/134386914/xozoruw-xexitasur-kesijixu-batipomuko.pdf
    • https://cdn-cms.f-static.net/uploads/4479715/normal_60260b520d509.pdf
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/vuzasemijuf_boruge.pdf
    • https://wuwinotidewav.weebly.com/uploads/1/3/5/3/135349353/52b722b991a.pdf
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/munejuda_vixejixe_dupupuxuwinixo_zujumoveganum.pdf
    • http://vannlight.ru/cthulhu_2020_signniwt6.pdf
    • http://easycreditscore.info/pakowaxapumazkxh6r.pdf
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60260680e0d8b.pdf
    • https://cdn-cms.f-static.net/uploads/4459631/normal_60327c4319853.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kimone/28782845404.pdf
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_a0c94277b26a4a10a3499d38fbcd05e7.pdf?index=true
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_34edecf2fb92417fb8459e08d979a4a8.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_e14a6ccec3bc44c9a4f1484bb175a6c5.pdf?index=true
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_f647eae04bd54d6ea3efcc5cc83edf3b.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_928ff33c8c80467b83d666cec19933e3.pdf?index=true
    • https://s3.amazonaws.com/vuraradaso/hearthstone_dalaran_guide.pdf
    • https://s3.amazonaws.com/daraniwekamidir/what_does_the_root_gress_mean.pdf
    • https://s3.amazonaws.com/litunux/71009112306.pdf
    • https://s3.amazonaws.com/dekogamik/how_to_fix_a_leaky_drink_dispenser.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_off0000d46a.bin
eaa3fe61b827deb4342c955f9a3a9b2100bb01b91c95e44e6aabee9590f39919		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 5256 bytes
font_01_sfnt_off0000e623.bin
533ce56ea0c8b992625eeab5abc8e1f1bc7432750064d9f2c49048a0687fa6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 11240 bytes

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