Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c4003ffd34a576…

MALICIOUS

PDF

81.5 KB Created: 2021-05-25 12:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 89ed4c49ac71dc4b50745b0391a79321 SHA-1: cebd23dfb745c12c3d4e9b12d5b804488ea2fdc0 SHA-256: 28c4003ffd34a5761faf99b23d44e854c4b01475846ae868ea9cdaad1a1a1eb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jottigo.ru/strik?utm_term=how+to+calibrate+elcometer+415', is directly linked to the document's apparent theme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the embedded links.

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://jottigo.ru/strik?utm_term=how+to+calibrate+elcometer+415 PDF link annotation
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/wamarosulibe.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/197668.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/gusule/pepitopulinumub.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/cds_2_2019_registration_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22af3ef3-0a86-4e38-ba0d-73653475d85e/pathfinder_kingmaker_magic_weapon_spell.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/the_education_of_little_tree_book_club_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be8ca1a-ae6b-42ad-8d67-5acb87fee4ff/cost_of_magic_bullet_at_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f10921f-9df8-4c21-acc3-4c14db8ea5c9/63749061481.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/85517033597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035f3b22-bf4d-4984-a169-06c57cb1b6c1/moxevav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b697d103-e0a0-42a1-bedc-66c096386c08/how_to_earn_money_from_home_small_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa007e28-e18e-4e2c-9d8f-ba9fc8b82ec1/what_are_the_4_types_of_research_design_qualitative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289c455b-d50b-41ce-8272-73ae8d1599d5/kilokukewitatewewexaworu.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/directv_remote_control_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff988b0-ddae-4169-af58-7f6efa6ff7c6/gekegesaluvuzafojo.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/discount_fly_tying_materials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a19cfb-0ccc-4eb7-aad5-bd35a645ec48/hp_pavilion_dv6000_drivers_for_windows_8.1_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/detailed_explanation_of_form_3cd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650cb51a-6484-4619-a239-0f39e0bc82a1/8_parts_of_speech_with_meaning_and_examples_wikipedia_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3748632a-f654-4df2-aab4-27bb7a492e3f/best_short_stories_of_all_time_book.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_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 5224 bytes
SHA-256: 65f54dcd014175e93f98eff3459def5fa1dc43dd2d057d5e62b9c674c1f51dc3
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 19256 bytes
SHA-256: 8de10beaaae909ef4224c9d0d26e4c33ef306195d8860592f52e491ad58894ab

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