Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77bf3dcd6522dee…

MALICIOUS

PDF

85.8 KB Created: 2021-03-22 10:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: edd6975f0c5afbecc703d1c2dbad26fb SHA-1: 9c309a8c2bbeb51285860c9e4c551f9d6d112266 SHA-256: b77bf3dcd6522deec99799b0c791b04561480f29b2e62b3dbec58c623aef3c4d
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://crophysi.ru/strik?utm_term=denon+avr-s900w+bluetooth+not+working PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387420/normal_6005f0e067884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_6010889048c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_6022c72c1e2b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5fed03e859806.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/zidenigad/all_codes_in_army_control_simulator_2019.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_116372ed64ab4a95a0cd9c9930a2b1d5.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_5a218f9ee38d4470bd58b7ec4cc770a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/soundlogic_light_up_bluetooth_led_headphones.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_6f9db9ed82d74bf986790f5e9f78a178.pdf?index=trueIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/10738554330.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_9db89068adcd4a5a8787ef4147819a70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/desktop_support_engineer_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/how_to_calculate_joint_probability_distribution_in_matlab.pdfIn PDF document text
    • http://vawofirulev.myartsonline.com/ludes.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_50b90152cd3349469315b25d51becbc7.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_ca4feebbde2e4469a59ba562d831873b.pdf?index=trueIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_8217d4ab9aa5421d8e7d59cce80a2431.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_3af76c6a2fe14409881cda267227148c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nimuwet/worksheets_on_homographs_for_grade_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 5632 bytes
SHA-256: 2cd3ab8e09064031e0866ad6c2b9409eb33314a12efdc39977d847a0138790a6
font_01_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 10960 bytes
SHA-256: 607dca526d82fa6e1d9be3a8cc608bdfe55abf51bed4f44186862c4f7989b7e5
font_02_sfnt_off00012f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 17672 bytes
SHA-256: 9ea6bf17b5b7d7b813dfa8d28e023ba7ad5417a99e97dab73720754fdb65ac1f

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