Malicious PDF — malware analysis report

Static analysis result for SHA-256 7441cda84bd4ae8c…

MALICIOUS

PDF

87.9 KB Created: 2021-04-03 08:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ecda784aef90ac4deff6eba82ec69e74 SHA-1: e7dbfa733e68c169fcbc2bd5f36348c629a39dfd SHA-256: 7441cda84bd4ae8cd336cdfb31f92dcd07a9e699b14cffceb0a56942ba1d457c
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 0.9996

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://pelibifir.ru/award?keyword=chemistry+notes+class+12+pdf+free+download PDF link annotation
    • http://wulixiv.sportsontheweb.net/wosevifobonexukovulowak.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/mujesogi/gabal.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/89252109265.pdfIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_bcebb2e3d71e4384bcf698cf2499ae3d.pdf?index=trueIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_d4932341444549f9a44452df1c33ff5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/why_are_ge_cafe_appliances_so_expensive.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/apush_period_4_review_sheet_answer_key.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_f034d9c5359f4f6bbabae7c6706308b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a71acfb-766e-41c5-b944-1a4365611b1c/nasoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/79518356772.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_117b17c3a8c5492dbbb1d491e00dba2f.pdf?index=trueIn PDF document text
    • http://nejimafalun.onlinewebshop.net/45783517360.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_34c55517fcc5499c88629895376a9a10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/lawogukew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b390e4-f16c-4cd0-b4e2-4f5b0f3d52a6/what_is_agile_project_management_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd84b56-df84-4b04-8b1a-f26c1fd489e8/34366549309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed370e31-d975-44a1-96a0-c17e3ffaeba2/how_to_reset_epson_l380_printer_ink_pad_counter.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
    • 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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 5676 bytes
SHA-256: 21dffea5279703b8bdcd511cc88e4ca01e7bf41864f2b5947df73bae4a34b37a
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 11440 bytes
SHA-256: 5bd1261a7b317c77e5bcfedada3f93f5c95befe09dace75a2a9951b6a4fa08ea
font_03_sfnt_off00013cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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