Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4a29156e2e5642…

MALICIOUS

PDF

83.5 KB Created: 2021-03-06 09:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ce4021d4b82ddf94f920887ce47dbd9d SHA-1: 062f858652c157b794e6f1dc4e0b55b47b014c7b SHA-256: cc4a29156e2e564239b564bba52c5d73bb7bc1bbdd3f3daee0313f6c501ec732
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://soxebez.ru/wix?keyword=cualidades+del+sonido+intensidad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450430/normal_601f7eb5d269c.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/zukupiwujuj.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/tozafaxenedeki_zewiwatejazop_xugemusobuf.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/702094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5fced68f64f80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_601f1046148d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443810/normal_600388698b1f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5ff29361eff0a.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/veviso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478667/normal_5fc7d0ad16dfa.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/8416405.pdfIn PDF document text
    • https://lokaxanexu.weebly.com/uploads/1/3/4/6/134638146/1028166.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/naxasozugaj.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/gopaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_60324935ddaf7.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/142375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_6f0f48e7b7e94dbd9bdd5e0e5d8c7069.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_ae94f5b14a064e2ea8b98b164ad1b1af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6507be-8393-4d7b-9469-d9bef81f2efb/thinking_like_a_lawyer_colin_seale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449e8312-5065-4807-89ce-8d01323fc5fc/gramatica_espaola_para_extranjeros_gratis.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_c4a7f0fd457c411ab30b0fe2a340bfb7.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_2c2e25f7e29c4f2abf06206bfdb82f63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed85588-73cb-4aa7-91af-07d85bbe7764/vewezukafanuzijirojovidub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcbfe283-77dd-404a-8376-8a56a76042e5/pabokugumigejopusiwuta.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_35a2087c8c0f4ff58a83390efc55150d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32e762a-30c0-4d93-929e-0ae20c05ea82/sony_rx100_ii.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 4628 bytes
SHA-256: 2f5d7ccc2e9bc08ad08cee57ef786d09ffa956391a3ead3d0950776607f04cc0
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 11224 bytes
SHA-256: 7abd31c07a6a4e614527033514207f2f25af72c9b611b703c9c9915e223a329b