Malicious PDF — malware analysis report

Static analysis result for SHA-256 413d6128e122740b…

MALICIOUS

PDF

75.3 KB Created: 2021-05-09 23:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d7f2f0a62af34aeaf835ad8727067977 SHA-1: 588208c941e0ece8e162c500db9b5101ff6d0232 SHA-256: 413d6128e122740b09eb6e724cd6fdf80789d7e6f06cce747d09fb7cd84ebb2f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=manual+para+tocar+guitarra+rock+blues+pdf PDF link annotation
    • https://cdn.sqhk.co/wemorapi/ohfhfib/49532603230.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/gfighga/48317133492.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/jdhc4Jj/at_t_device_unlock_status.pdfIn PDF document text
    • https://cdn.sqhk.co/fakozunada/wigihxo/lejefisora.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/8VT4uMo/five_interesting_facts_about_earthworms.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/GgcamXM/69330945894.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/AhdjeeY/personal_bio_data_format.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/b1344cda-6466-45ef-8bf1-d827c307fb3b/what_is_the_setting_of_harry_potter_and_the_half_blood_prince.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90152e5-2eae-4563-8214-aa25ebdbff0a/canon_lide_220_manual.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_8f3ca8816cb14fa597a36035ebb7c93c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kofabube/tutorial_asp_net_mvc_5_espaol_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88298d3b-7dc3-4b5c-94e8-69c0d9e21377/noliwepafemagor.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/logo_design_contest_india_2020.pdfIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_8578984172cd4b6cbbc13dfe8f789e32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/42819812968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b5e515-4dba-4f19-8443-b256ab00157c/fexipem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ed0203-de3a-4020-8c6d-081c757783bf/gre_quantitative_section_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e78117-7199-43b1-827a-59b4bfce96f9/equal_employment_opportunity_sample_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e3aba3-31ee-4623-8bf1-9061156fcbd0/jazudijadifijaxam.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/software_brother_mfc-_l2700dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dace7ad-4539-4681-8241-2647962d2d0b/best_dd_dice_trays.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/everfi_new_insurance_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 5532 bytes
SHA-256: e1cd880e9eefe48795e52d07949c1e6c3c21d6b8288fc4a3448fa26ace98b68f
font_01_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 11840 bytes
SHA-256: bbfd389c3c9b8ab89ec6d88e1f16a58db71e2b1af7a8563d626872a30ef91ddc
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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