Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ffa11a59ee6b5e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-26 07:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2e2ddbee0c7ff80b4b13250ea1786c9d SHA-1: 6b8b06efbc10db065b51ab122c6a964ada2eaa3d SHA-256: 63ffa11a59ee6b5ebcdadc5f20c510c8f197a56617ac8a1964efaaa3bfe396ab
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The primary function appears to be a link farm, containing numerous external URLs pointing to other PDF documents, some hosted on disposable domains. This technique is commonly used to obscure the ultimate destination of malicious content or to distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=brief+schrijven+duits+informeel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489846/normal_60492c5f2d5ea.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/1248443.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/7008798.pdfIn PDF document text
    • https://zavelodenewiguj.weebly.com/uploads/1/3/5/3/135314669/1445550.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/powejigelijile-dopibebe-lumajem-nakafebibowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_979eeb1eb2cc404fb821b5fa7ceceea8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0614da2f-0da5-45ee-ac87-deca66fcbb9d/lulisugevuvezunaxufevo.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_5812e84315fe4da5821c6b9664b2179b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/xbox_360_s_with_kinect_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2719c075-6675-45c1-9abd-f4ff683b3bdc/funazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0a6710-0142-49e1-a592-75e70a42e52f/tone_it_up_reviews_2018.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_4e4775ce57df4389a0ab9d30f0fb1651.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/45297682985.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/70002666422.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_35dcecee4a3f4b0189740124745e9de6.pdf?index=trueIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_de6f04b4913341c88018c9553366d703.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_9e09da89d67849e6ba7d78e3422ec8e8.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_b5bf9ac0e6cf414d951160e2adf265e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/bailey_and_love_mcqs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/25036551606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2ff0ec-a710-4c9e-b7e2-0e174d35c098/34106400994.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_e7ac463f369e4601902a76281bb37edf.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_a31cf67f37fe4d389f39d01a4f353d04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3bbcb7-3f36-4b69-a8c5-7bb361ed1479/beyond_stretching_vs_relax_into_stretch.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_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 5236 bytes
SHA-256: cb63d2cd6ee04249048d69e0f6519f836f4f53227af100aaa8553fca4fb9854c
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 11520 bytes
SHA-256: 87d2df0c48e7824ec9c52b06eb8cbefa2b36a15050f35272982f782d095e4437

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