Malicious PDF — malware analysis report

Static analysis result for SHA-256 377e39daa92bc3f2…

MALICIOUS

PDF

83.0 KB Created: 2021-04-01 17:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f314cc2d4349823fd4177d3dd1cc66e SHA-1: 15f7759a2e780da823341fe17618b451a4c47bbd SHA-256: 377e39daa92bc3f2bf2771cd22857857cdfbfe4a847a293681cd0610108fa771
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/strik?utm_term=how+to+prepare+for+qa+director+interview PDF link annotation
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/8472681.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/bereturat_pegexulufe_xuzirujalowadiv.pdfIn PDF document text
    • https://ranedesipa.weebly.com/uploads/1/3/1/3/131398497/7385557.pdfIn PDF document text
    • https://jedagafigi.weebly.com/uploads/1/3/1/4/131438055/2115581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff097e9abcd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_601b26ecd0fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_6025e7100f221.pdfIn PDF document text
    • https://sazekunoteti.weebly.com/uploads/1/3/2/7/132740187/5e2005d55.pdfIn PDF document text
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/a0747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5fe01df285a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_6045cb8e9c9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd69faa01955.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/rasonofebafakeke.pdfIn PDF document text
    • https://dewapapowirise.weebly.com/uploads/1/3/1/4/131438248/befazeb.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/154185d0-8850-4476-b477-9368a4bdf37b/wujejoxepomejoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0e1603-e3c9-44eb-ba94-0f24db93393a/jatomofimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3a91fa-d7ec-48e6-8956-9f457fc132c4/char-broil_tru-infrared_patio_bistro_electric_grill_gloss_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9f8d51-b160-4f10-bde3-1d4b9a347ebb/dimofifujuzosuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba2b289-0f82-4b4f-b6c8-5359623f3d23/luvexuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1f918f-ee32-4c71-9224-8c39f5593de6/how_to_cite_apa_style_website_with_no_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc27dc4-f556-4024-b471-fb56c37b64c5/asus_strix_geforce_gtx_970_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdc59cc-4887-41d0-bec2-f2355d1772d9/76746511708.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_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 4964 bytes
SHA-256: 384cd791b9cdfbcdfd20c2fce7c1292b060ee65c4ef90a96c3fa3add93a9426d
font_01_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 10752 bytes
SHA-256: 0e7669c33e46eac63954b09898e267b64d7a5ccf9f261a4e917bff158e2f18f0
font_02_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f