Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf77fab14f28fb5b…

MALICIOUS

PDF

78.9 KB Created: 2020-12-11 03:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: db140cddc1f64c58ca89f12f394e5e23 SHA-1: b6765d90742c8aa5cf3a8fcd5a2c89afc7c800d9 SHA-256: bf77fab14f28fb5bf6d8435b7d2057018de87e6e0a34c88a4e5a2062dd19845f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic indicating it's a social engineering attack (ClickFix) that instructs the user to press Win+R or paste a command, consistent with bypassing macro restrictions. It also contains a link farm with numerous external PDF links, one of which is a phishing URL. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafffe.ru/strik?utm_term=onn+wireless+mouse+won%2527t+connect PDF link annotation
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/9435421.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/legilupape.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://s3.amazonaws.com/jazuravazaguz/steel_rule_dies_sizzix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c83804-b491-4dd1-bc87-ceb943518f04/paul_mitchell_flat_iron_spray.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/67303454228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad84c7ee-4e19-4712-ac37-89ad8e2006ce/92314383650.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc110906609fd0ee7923de0/t/5fc2cac71972c46e3cfa7348/1606601416522/fogged_tryndamere_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364ec0d3-dbfe-4a4c-86e0-4c532fdf925f/european_buying_office.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e7c288c99b6d37a72027/t/5fccfe8574a40730fb9bb8b0/1607270022615/99196724308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ebce0e-bf47-41b6-b71d-cebbb5eb56f3/township_cheats_that_work_without_human_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b24615c-6cba-4d41-bbe0-bb2dd3c8658a/verawitaxaxasuj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50bdd239b0722914be43a/t/5fc7c8c221434e227345d8e6/1606928584186/barcode_scanner_iphone_app_for_inventory.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 4772 bytes
SHA-256: 9a38663f301c8a54362c5574faad66dc3cef32cb1a8cdb5d36fd4d796895d68c
font_01_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 10848 bytes
SHA-256: 8910c92978cc9f5119f0ddc1fb062711cb1754850eeee7f26db8c56fceabc00e
font_02_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 16116 bytes
SHA-256: 01d5f6b849ee38655b0800083304900f34edaa75e5545ffa95f28d44bd3e4f7b
font_03_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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