Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ab638a99f0cc58…

MALICIOUS

PDF

82.6 KB Created: 2021-03-18 21:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d3933e23e4f2e7fd4392d1e92131a85d SHA-1: c13a9eb486202020c7b93e578631af35b74c9b06 SHA-256: 55ab638a99f0cc58f9107954db0f55a2a65f087aa3f95f424c9cf197deae763c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with one URL being `https://xezojetit.ru/123?utm_term=happy+marriage+anniversary+song+free`. The document body, though heavily obfuscated, contains text related to anniversary songs and the authoring application, likely serving as a lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

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://xezojetit.ru/123?utm_term=happy+marriage+anniversary+song+free PDF link annotation
    • https://cdn.sqhk.co/buzaxelubot/jg5iigd/lullaby_lyrics_for_baby_boy.pdfIn PDF document text
    • http://adv-workshop.site/logo_design_software_free_download_full_version_windows_717297.pdfIn PDF document text
    • https://cdn.sqhk.co/nujekezitifi/shjmJjg/12475371518.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • http://5dradio.ru/ernest_hemingway_list_of_books_in_order8bs1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/sorogamat/80182294731.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_c55798e102084d97b22911cad6d795a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/what_type_of_organizational_structure_is_nike.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_41bdde19798345b8803e06c79c739379.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/790a8cad-36e6-4ee6-8971-c70d6cf2bbdb/how_long_is_a_30-06_bullet.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_8e207f5d3d08403ab8d4de3af662aceb.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_a8e736dd67dc4f38919ef3589eb0ee5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/calculation_of_standard_deviation_in_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/47306246494.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/20894942543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41649709-2bc3-4a1b-a8a4-54f9c13d1492/every_living_creature_on_earth_dies_alone_tattoo.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_14ec0681626e4d2c8ecbab37dc49430b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/23824887558.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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 5312 bytes
SHA-256: ab619f02ee504221ebc39f6dcd668e2779f99e91ae0a3650b3f622b521512699
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10952 bytes
SHA-256: 41d665c6a44f595878ed5a965d1fb24aec760951b4f3ca4c2c948997cae32568
font_02_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d
font_03_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 3224 bytes
SHA-256: 9e1af15abc8c71b21d2e921d0a2efffb7dce6e66f4c972f9f65f13edd275f1c9

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