Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51583256a3f3e86…

MALICIOUS

PDF

89.4 KB Created: 2021-03-10 06:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f035db7d3ca4200520246e57cd8430e SHA-1: d71233c6f1d3990379e22851df368b4805b6daf3 SHA-256: d51583256a3f3e86733e92d9cb046a6e4d62f18a33e3a5dd4d87efa34a9af07d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://midufefew.ru/123?utm_term=holt+physics+average+velocity+and+displacement+answers PDF link annotation
    • http://famozosivupiwij.sportsontheweb.net/55559044819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6041ec8a67722.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/45423382000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_5fe6ed0a25452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_6001dacdb6972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_601f6b092c19e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_604392afc7261.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/79768521679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5fe065b2bb682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bivojeda.atwebpages.com/demoritovesulomu.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/algebra_1_regents_june_2018_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/certificado_medico_escolar_2019_cdmx.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/lasagamemulalamuripip.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_68c758e02fc04782b438c1939a7c0c68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/18123256421.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_f2c2adc84ab04df2a44c8493e52f870f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/zedolefepitulukom.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_0a7cb682655149dcb34e82d8dea96459.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_b480b1a39dff4832b3febc9ecd76b258.pdf?index=trueIn PDF document text
    • http://tevaluzax.atwebpages.com/blastocystis_hominis_tratamiento_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/adventure_time_theme_song.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 5488 bytes
SHA-256: f3b6169122973b843f5b516f5b661b5052608f4944bf8145a730e2b057ed39d2
font_02_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 11060 bytes
SHA-256: 1ab6301c3b1dd707d9194f891e6ce76a24c86399138041c602f343ef67e68d15
font_03_sfnt_off0001471b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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