Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7be8a3f7e349a3…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 15:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a32a8db819d3a7b913d8f01c10122376 SHA-1: 2e852e993ca74a9d79c4ea06039bdf2d6834b541 SHA-256: ca7be8a3f7e349a34fedcf86f59ac1501324da3929f8977ddcac0503cf58eb04
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to dafemum.ru. Additionally, ClamAV detected the file as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is likely intended to lure the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=images+from+celestron+nexstar+8se+telescope In PDF document text
    • https://cdn.sqhk.co/sufokorume/cjxQJgj/74387832665.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ab3ifmh/43693616431.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/bhciaie/suvogumowim.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/TXy9Fhg/map_navigation_voice_language.pdfIn PDF document text
    • http://lalashoppen.online/odia_love_story_album_song_mp31cf87.pdfIn PDF document text
    • http://fly-drive.online/zagubobamd6532.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/iejhjtF/mobile_gamepad_controller_for_smartphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd60d3e1-35ce-4039-859d-e0683ab7a4b6/43496064685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6095e61f-65a3-44a1-b835-3117e7063278/how_to_make_loom_socks.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/greeting_card_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8d8061-acfc-499c-8bff-cb55fcccfd2d/69722345374.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/celf_5_scaled_score_to_percentile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf33af4-ebe8-4215-93ee-292b3af45214/193338530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a76fd5e-7894-4e8c-9daa-5bcf15dac667/que_es_el_proceso_de_investigacion_cientifica.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/what_is_neoliberalism.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/14219497771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bfc6f0-3387-48d3-8ac2-59ff79df0457/lapadibowuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd9a708-68e0-40c1-bc15-b7ac1871ca9c/kenmore_elite_slide_in_gas_range_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/instagram_story_questions_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/is_intermediate_microeconomics_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/zoxuvibenexokimudukobe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 5532 bytes
SHA-256: 60f8680e655bdf6b202af33babfaa3c45dd801b61afcb405b47a9c5cae461ee9
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 11296 bytes
SHA-256: 69adb0db0009171e0f2a245f93e7ec6b64ee75f974707aad60ca68671fa1922a

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