Malicious PDF — malware analysis report

Static analysis result for SHA-256 559baf61d857f2b0…

MALICIOUS

PDF

80.9 KB Created: 2021-05-24 21:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70d5c8758d565fa2b2046407bc209de8 SHA-1: 54f43a9834e77f95dfd17d84e9a0c0e4b5483e45 SHA-256: 559baf61d857f2b0009964474f0868613282b03b868df5a07331429c4ddbbabe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one critical link points to a suspicious domain (midufefew.ru). This suggests a link farm or redirection tactic to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=denklem+kurma+problemleri+konu+anlat%25C4%25B1m%25C4%25B1+9.s%25C4%25B1n%25C4%25B1f PDF link annotation
    • https://rafanubenab.weebly.com/uploads/1/3/4/7/134747024/gamofap.pdfIn PDF document text
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/8985ae3d43e04d9.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/b2107f7bbff8f86.pdfIn PDF document text
    • https://zidifupo.weebly.com/uploads/1/3/4/4/134475425/be1db5c9f.pdfIn PDF document text
    • https://rajivuwos.weebly.com/uploads/1/3/4/3/134398668/4957508.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/38056698-1af3-46d0-b821-62278c45c6e3/realidades_1_captulo_1a_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/angular_2_form_group_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5b836d-f01d-457f-9846-c6f623e2263c/what_does_wallah_mean_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1074f454-9d16-442f-83da-62983d0ee723/infinix_note_5_price_in_nigeria_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886712b9-202e-4e7b-a111-f62fe35d7b4a/fozutoguxunazevav.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/60973361476.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/what_is_business_by_authors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfce864d-66dd-4a78-8fe9-a64cdc4b0b12/tecnicas_de_cultivo_de_arroz_en_china.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72aeb2e1-d303-47c7-ae00-01190805cbd0/how_to_write_a_novel_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8116436-56f5-4e07-976e-4530efd711f5/27409385627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2023cf-75e7-4615-b796-ce0a86166ebd/pitapitukugez.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/9281361934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28045b4-fa51-4e1a-ba44-a1cab8005830/votunileselowozinuxuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d03bb7-b4bf-4ea7-b10a-dc09f7fe6b00/lisoronuribo.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/65178611178.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/72831721805.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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 5472 bytes
SHA-256: 0952c50b19d78a683ebeffadf88150a1db09da1be0a631a7aa7e2d686e9cdad0
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 11132 bytes
SHA-256: 0039ec96b5685e0734782988628c2949eb43e2677cd1144e98d67b9415dd6b89
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501