Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d661a1fd54c0730…

MALICIOUS

PDF

79.0 KB Created: 2021-05-30 08:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 740fc675008d70e0fa8559803cd6abc0 SHA-1: 8602e6c845a85b4eaded04c6b80af876459cc914 SHA-256: 8d661a1fd54c07309c8e77db74a8b7e9112ae147164d8802cdf492220d8e7416
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating it's part of a link farm designed to drive traffic. 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 embedded URLs are indicative of malicious activity.

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://zajinet.ru/strik?utm_term=how+to+draw+a+girl+body+for+beginners PDF link annotation
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/9539574.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/kikoxosizisi-niwavonuzal-rireb-wibixujixiredid.pdfIn PDF document text
    • https://borojiwanap.weebly.com/uploads/1/3/4/2/134235821/9ae39a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5ff278297f3ca.pdfIn PDF document text
    • https://dasuzixegofewaw.weebly.com/uploads/1/3/7/5/137501835/e4eb0fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_6032934e522b8.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/bujusapuragas_foxalamoradenod_pexumafuxemene.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/2853129.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/eff78b2b.pdfIn PDF document text
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/82073526a65e0c2.pdfIn PDF document text
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/36783eba18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_5fe73404757a5.pdfIn PDF document text
    • https://webonuru.weebly.com/uploads/1/3/1/4/131437172/damumagap.pdfIn PDF document text
    • https://vexojuvij.weebly.com/uploads/1/3/4/3/134345090/7082239.pdfIn PDF document text
    • https://magifoxokepo.weebly.com/uploads/1/3/6/0/136053300/rikodazonot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_601af6921b05c.pdfIn PDF document text
    • https://ferovagadimi.weebly.com/uploads/1/3/2/6/132696304/6154de0f.pdfIn PDF document text
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/8953859.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/0e978f2c-2e48-4a62-b77c-ed9bfeb8bacd/how_to_know_baby_gender_by_placenta_position.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6391d220-5408-41b9-a3cc-39d091b45544/pogigaboposiperijidaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b424a12-aec7-429b-935f-5c9d28030a07/76696522003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e852738-61c0-49ba-a144-34fae2cc5799/81919077449.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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 5160 bytes
SHA-256: e236b85e3a4ece19b7dfaf78746f18347d7af1702cf6e60f741bacce7d49f113
font_01_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 10736 bytes
SHA-256: b1687ca777b7ba11dfd67b98c9a1179535cca8478260bedf676f79aa5853f906
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f