Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9fdd7e583a2cd2…

MALICIOUS

PDF

69.3 KB Created: 2020-11-14 15:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5f8f421bcfa9ef7c06df4452ec6278f5 SHA-1: 3fe647f0001905eb93a8844de79b82595c93ef3c SHA-256: 9c9fdd7e583a2cd25a7167f5f23ec1f37e4bb7e36695537b7a9d707a925b9c8a
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 0.9998

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://trafficel.ru/strik?utm_term=strategies+for+technical+communication+in+the+workplace+3rd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490516/normal_5fa9bd17c0c23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f9a69fcbcd2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5f8d615ed05fa.pdfIn PDF document text
    • https://mekadademuru.weebly.com/uploads/1/3/4/3/134367219/dawowajazedibowazizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5f8cb98f67553.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
    • https://uploads.strikinglycdn.com/files/98564993-c16c-4093-a02d-f7f0d331a4c0/vuzivipozuman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacb66a6-a06b-4788-9d3a-0820cd3ffbda/va_form_26-8937_instructions_for_completing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4d6e43-db70-42a4-9e3f-789c45aecf9d/icwa_law_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3064fba8-b1f4-4840-9c77-1b55f1623d8f/good_moral_character_letter_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a00e4b5-f028-452a-926a-d1f10dde827b/willy_cardiac_age.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/pre-_calculus_12_mcgraw-_hill_ryerson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab85a24-0223-4d1c-a1bd-5ebc4b419db1/mavodovomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76211ed-cb49-4be1-8d18-dc9235cfafcb/disgaea_4_character_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96127d5-e3d6-42ce-99f7-f1b6c2d49c91/kimugebuvoforijunilug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe733b5d-bc6f-4ebf-ba89-bc79d5fd705f/42113630040.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 5872 bytes
SHA-256: 5ac047e4df7f48ee6bd059220f9ebeadbf1051e42ed43993b2ab76322014a3b4
font_01_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 9192 bytes
SHA-256: 43e8188d0fda340ded67e1a71f77d4f73326050684b9432e97301e623b4bd284
font_02_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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