Malicious PDF — malware analysis report

Static analysis result for SHA-256 daad51e6be7d8252…

MALICIOUS

PDF

77.1 KB Created: 2021-05-11 06:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: da9ab39a58926d0ef9e556e085171384 SHA-1: a9fe2931f6937770b754930b7f20e0c0008ec029 SHA-256: daad51e6be7d82529c96436a4ea20d2758a21b77acf9eeb442b23a9c9dc5dd83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a scheme to generate traffic to numerous external URLs, with one such URL being 'https://golowaki.ru/strik?utm_term=poulan+14+electric+chainsaw+parts'. The document body contains garbled text and metadata related to its creation, but the primary malicious activity appears to be the redirection to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=poulan+14+electric+chainsaw+parts PDF link annotation
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/legeresej.pdfIn PDF document text
    • https://cdn.sqhk.co/redixebu/fhghboJ/85456057827.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/eozrpc1/stadia_controller_bluetooth_2020.pdfIn PDF document text
    • https://zuxovupogoxa.weebly.com/uploads/1/3/5/3/135386903/fijajakema.pdfIn PDF document text
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/gomenotogoxore_kofonijufufofew.pdfIn PDF document text
    • https://latiratigu.weebly.com/uploads/1/3/1/1/131164156/lumemawuxanulamo.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/h1pOsZG/destiny_2_cabal_killer_guide.pdfIn PDF document text
    • https://satomasutal.weebly.com/uploads/1/3/2/6/132681949/e8873f8b95c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/vQijgcO/health_and_nutrition_degree_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/anemia_and_ckd_icd_10_coding_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09cba169-edab-4167-8bb4-f6d23bca20f7/walmart_tires_size_215_55r17.pdfIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_58e142afd89e455a9c0ef69a6262c55c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f99f2c-1969-409f-958b-f07d6c5ef9c8/voxerapatesagaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da574d3e-752e-4b5e-add0-fe7a31886c24/25345702434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a32257-4403-400c-8cb7-7d249ec3518d/ejemplos_de_dispositivos_de_entrada_salida_almacenamiento_y_procesamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/51338100812.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/zagusolopalitofu.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/tecknet_mechanical_keyboard_software.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/12926910378.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/zavosusofagesawisumama.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_46dc9394e9264b77a990aa96d776ef59.pdf?index=trueIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_6296f606113c4197aa7ed25b34be997a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/how_long_does_it_take_to_write_3_paragraphs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2ef050-6031-469c-8f3a-38721b032b2e/best_c_book_for_beginners_reddit.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_b55ece58e7594c90b9d7181367752222.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/1369990189.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_d4e0a387cde745ce90b3125b4c533a2b.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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 5256 bytes
SHA-256: ad10702e789cd4730c47ec9ff4b0821ad71ecb026899257dc1c76eea843669d4
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 11184 bytes
SHA-256: 55af9b9a11cc7d19988fc7f1c611d6d630823951d3ad49e4f387ee35824e9cb6