Malicious PDF — malware analysis report

Static analysis result for SHA-256 c194e41351d413f8…

MALICIOUS

PDF

94.5 KB Created: 2021-05-23 02:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4812dce01c03c4a3a79997f13d796f9 SHA-1: e37b3c2ea71bb1a36639698dee1a9fce11325b72 SHA-256: c194e41351d413f8c70d40d57ef13a8b1be972b3249186e8c86b15bfa68d6f8a
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. The heuristic 'SE_FAKE_CAPTCHA' indicates the document presents a fake CAPTCHA, a common social engineering tactic to trick users into interacting with malicious content. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://bologen.ru/strik?utm_term=emerald+armour+mod+minecraft+pe PDF link annotation
    • https://gezajinesobovu.weebly.com/uploads/1/3/2/3/132303035/dezekuxaxawuzi_wimebafa.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/jiniwosoredujo.pdfIn PDF document text
    • https://pewukuma.weebly.com/uploads/1/3/4/7/134762228/9117637.pdfIn PDF document text
    • https://zotamitogimida.weebly.com/uploads/1/3/0/7/130775261/selinajaziti_busowowa_wolawogugivi.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/duvefi.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/tumuzu/wamolugijobinapokivu.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/sexogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b95c67b-8604-4ace-900c-d4cec2c964c8/hp_officejet_pro_8500a_plus_power_cord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d295ba-7eee-4669-908d-cd7dc8915154/voxomuvurigisite.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/3608550764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c98525-c223-44fe-b7ff-970bc0b5dd85/44576542832.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/laminate_flooring_wickes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/apa_bibliography_page_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/8490448885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f422c0-cc95-41a8-b9d2-5ee490eb9819/64079507956.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/degumobamizofotorokofij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccff33ac-7e99-4096-b0c6-7e825c7aade3/colonialism_in_heart_of_darkness_css_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683ec7fd-e3ff-402b-88ca-33e35a712756/30476047505.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/vue_form_submit_axios.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/nosaxoliz.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/39137689195.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/pentair_intelliflo_i1_variable_speed_pump_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40584ea0-5ae2-4379-8b08-221e6dd3491c/33655267885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea2795e-e9a1-4cd4-955a-8106525cc47b/genie_model_2022_remote_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/putazuwebifalupig.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/what_is_group_theory_in_politics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d58933-8f73-4f73-bd53-bee46512b543/what_does_a_pregnant_woman_mean_in_a_dream.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_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 5080 bytes
SHA-256: 33ac4a36f0a698c453c8a28947efa439d9795d91e691e1033a1545ac91088fcd
font_01_sfnt_off00013ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA9 1644 bytes
SHA-256: f51e468cad89be37a6377395ae51ea56b7319975502e3545cb67ca15c9b82b03
font_02_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 11548 bytes
SHA-256: 86320fbb5c87be5984ad4ab7eb9671e0b8ebbb7bc9f120a4e29b811042e8432f

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