Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf620312417c35f…

MALICIOUS

PDF

81.2 KB Created: 2021-03-22 05:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 625cb553d6754e299b46c7236b17b786 SHA-1: 99ac213be9fc092594f607bee9c100789d8bf33d SHA-256: 6bf620312417c35f5672a2b47c45e63096e7d33c06114f17a05c55ede22feb10
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URIs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=flyff+blade+guide
    • http://futup.ru/sims_4_origin_product_code_generator3lred.pdf
    • http://poopo.ru/wewawenifi7fq6p.pdf
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/2bcb8eb8db7.pdf
    • http://savadaqwe.space/london_metal_exchange_steel_price_graphltvn4.pdf
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/xobisazesob.pdf
    • https://fibuwusosa.weebly.com/uploads/1/3/4/7/134700524/7751978.pdf
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/3a580b58.pdf
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/6d020ad2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_0731a166f825414abc2da6581fb8a9ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f77ef07c-a4fc-4bbe-b17f-365ccf45b315/kexapekewogejivawikuva.pdf
    • https://uploads.strikinglycdn.com/files/85b2f12f-c476-4430-ab71-557a1565e173/26967076105.pdf
    • https://uploads.strikinglycdn.com/files/a916623a-e2f1-4795-a207-ab1c5067dc9a/interview_questions_for_desktop_support_manager.pdf
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_e77e243db00841ed8ccddf0f6e475933.pdf?index=true
    • https://s3.amazonaws.com/fopalew/demonstrative_pronouns_worksheets_with_answers.pdf
    • https://s3.amazonaws.com/wuxupewu/aw_tozer_quotes_on_fear.pdf
    • https://s3.amazonaws.com/bufexa/free_lisp_for_autocad_2013.pdf
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_57c21305da64406cab521d15791b7eb1.pdf?index=true
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_42606a4595be4d8f86ad5d5da9720ec9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19afade7-65d9-4f5a-8fee-cc35383a6dd4/xudafokadenusisa.pdf
    • https://uploads.strikinglycdn.com/files/3701b9c0-3a37-48e0-a2c7-7c7532518dd1/math_worksheets_for_grade_8_algebra_with_answers.pdf
    • https://s3.amazonaws.com/sevoga/vukegobilosabeguj.pdf
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_47c304ecd3d7499696aff641816efa7e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cbb128ce-7e70-4829-8dc0-99dc5d7b2c44/the_boy_in_the_striped_pajamas_shmuel_father.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ad.bin
c014308ddb41e0718451c39790b8fd1009f511a0ad64f9312733f8ed4f985867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 4996 bytes
font_01_sfnt_off000111d4.bin
b1bf0cefa7af22fbf01fdb746744abb08d591d18a46f95fd8be5c6d4152ebd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 11108 bytes

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