Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e9e1c1dd320d73…

MALICIOUS

PDF

76.2 KB Created: 2021-04-08 02:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d4bc5dca3634fc7bbdc99850e64ab556 SHA-1: c633b3187401cf8d952f5d961b70707e4b7aaf50 SHA-256: 94e9e1c1dd320d7349babcea3b12c6ef5a47ac915738bda4832aaf21a7bb9080
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=panaderia+la+espiga+de+oro+telefono PDF link annotation
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/vugifufunok.pdfIn PDF document text
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/naguguwona_senupivudoguma_budovumij_mirutubese.pdfIn PDF document text
    • https://pimobepasad.weebly.com/uploads/1/3/5/3/135347335/8840854.pdfIn PDF document text
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/3b0bb00a.pdfIn PDF document text
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/b46e1.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/49a080da-adba-4094-81b1-5c12cec39171/53184065157.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_144d589385b54bd99087c59353d8b37d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e91060a-e767-4311-893e-fc9acde9b2ee/zarumemuparezabodoba.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_1f8abf80a2054f09b740d3b4e665f6fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/071b42b5-ae8d-4878-9cdb-003db25552bc/comcast_remote_guide_not_working.pdfIn PDF document text
    • https://4ebe1e6a-8a13-4145-b3c2-d2faed65f423.filesusr.com/ugd/a67e73_d71672ce17914648a3f2cf71b86b10f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedilegol/formas_de_tratamento_do_mal_de_chagas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20268f12-db3d-4710-9cca-def300ac7336/used_yamaha_disklavier_baby_grand_piano_for_sale.pdfIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_ecf7383eddd84b8aa638cb15e48eb2eb.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_db5ba09e5d5249ea836f1a0f9a893869.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/62344358714.pdfIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_8f310766c9824dfc9cbae0fd586154e3.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_7b233a1586454947b7cd5d521608a694.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_f72021495bc444f8a391b26bdf985782.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba2b786-a533-42d7-9b3c-e10d22d0320f/is_the_after_book_series_good.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/1815717061.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_762c51fa49c24cbb9cc7e5d48f0409be.pdf?index=trueIn 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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 5212 bytes
SHA-256: 3b7607152f1125a36a83aaffa5cba560f8e5f0da3ef040f1045b44316ac3ab85
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 13804 bytes
SHA-256: 7f5391c54feb6c19773dacec9b41ae1ed14d6391f8bdb08170306d2985a15f34