Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba3751d7c74d8b0…

MALICIOUS

PDF

85.6 KB Created: 2021-03-08 03:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 56892f45b72e7eb4c152ee4d126add4e SHA-1: 9825f8168114fe5c92810d45510c95c4a1660dfe SHA-256: 4ba3751d7c74d8b078fed88b3db234804a74d45036061c8efd45af5725dfb1bc
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/wb?keyword=the%20star%20of%20bethlehem%20movie PDF link annotation
    • http://dewisazovuvoxi.mywebcommunity.org/51547123970.pdfIn PDF document text
    • https://kizofirelurok.weebly.com/uploads/1/3/1/6/131606598/9519532.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/65221536270.pdfIn PDF document text
    • https://verosogoteri.weebly.com/uploads/1/3/4/7/134738646/18b9281013.pdfIn PDF document text
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/8990691.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/18e1d6f3-e8de-451c-8c84-203d2590db27/stihl_ms261_vs_ms_271.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/ben_10_omniverse_game_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f801a9b-1dcb-4cb8-b3b8-cf484efc88b7/words_to_explain_poetry.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_ef3da8ec32524fbcb1510b2440b1e927.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_37e80e8d2d1c41ceb60fc1630f1ec091.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_72f27fc68ea3432a9593bf63f32da99c.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_aa6969d68f424ccfb16947ead2b9f1ba.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_3db2bd96925642bfa850ae1a071eb942.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_2cffea27769e484f80e80232d8592791.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_37a14c1805864a14acff5c6ae52bd2b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe612cb-546a-4f8b-a33b-b5036caa08a1/how_to_put_baby_in_ergo_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d16e122-b95a-4575-a7fd-e208215f43f1/ap_english_language_and_composition_practice_exam_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/gamepasoximutazuguk.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_0fa6571223284b439ed61d5606ba2328.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec4b5cf-4cc2-414a-a576-3f00fa3740e7/how_to_install_mendeley_in_word_mac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 4840 bytes
SHA-256: 6fb2e71a4dd77d01c836ffd011a0cff368cb3d13e8006ec89605074122b61e94
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 12388 bytes
SHA-256: 92cb4cf0002a9721dad64a4700b69f810b87a10a62ea20bfdf863c7803a0ea74
font_02_sfnt_off00013b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B48 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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