Malicious PDF — malware analysis report

Static analysis result for SHA-256 823b16c6ca995e6f…

MALICIOUS

PDF

75.0 KB Created: 2020-12-07 08:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a17d735e0516626b3f28e64a0202730d SHA-1: d341c5990fa74bf45baea8e9a5b6300e6224cdb3 SHA-256: 823b16c6ca995e6f218f3d051d9b7109baf9b641200b78ca67264dc8e470b579
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'traffking.ru', suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=personal+information+worksheet+busy+teacher PDF link annotation
    • https://bigififipajug.weebly.com/uploads/1/3/4/7/134709095/fekowok-rodezuz-vajeben.pdfIn PDF document text
    • https://wefopizek.weebly.com/uploads/1/3/4/8/134849363/0eafd2a8a6496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f87226e2e45a.pdfIn PDF document text
    • https://tibaxefuxi.weebly.com/uploads/1/3/4/0/134017075/adeee9.pdfIn PDF document text
    • https://nixejinalir.weebly.com/uploads/1/3/4/3/134321479/00d9e0943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5f8e11ce23768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitatotol/cartoon_web_series.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/different_aspects_of_self_care.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/kumovomiralujuwimuvawoli.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/vipisuzisomuxupupaxejuget.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/fm_online_approval_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64b5b8ef7301f8b35b94f/t/5fca198987b36f46d4074048/1607080333267/water_park_slides_name.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/49154422187.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/45985043711.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/4690082665.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/suwotupo.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 5520 bytes
SHA-256: 129c200bf1f6538a32784dc2bea93d3939771e7f16e43a816533919fb72c852e
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10620 bytes
SHA-256: 31f23b20b359e2b2874b37d14f4af85a0d7b00c23310c4ffe4e013dde2d9e015

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