Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3187e11501a989…

MALICIOUS

PDF

80.5 KB Created: 2021-03-04 18:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef951e06a61e6610bcf616cebf24db03 SHA-1: 54a31088a3342034485e4c5240dfb14a47b4b690 SHA-256: cb3187e11501a98993d7a3c7b8851a6cfe89c9b84aeef2e3988583b9b4a3791e
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, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=troy+bilt+squall+2100+snow+blower+review PDF link annotation
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/sajete.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/87129849467.pdfIn PDF document text
    • http://bonboxstudio.com/rock_n_roll_snowman_lyricsiwhg6.pdfIn PDF document text
    • http://tuvexiwegivuke.iblogger.org/raviguwide.pdfIn PDF document text
    • http://sizegivip.22web.org/12048821595.pdfIn PDF document text
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/b490e63dcd7a1.pdfIn PDF document text
    • http://premiumpornclips.com/14538704982cjjt7.pdfIn PDF document text
    • https://denudosija.weebly.com/uploads/1/3/4/0/134017010/geligatowoda.pdfIn PDF document text
    • http://artdebug.site/gomufufuf023h1.pdfIn PDF document text
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/xetibememivo.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/mibitifezotewosini.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://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_0a66c64799a24abe9dc8eff580662e69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/lotuguzolomefoxuxitudak.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_b9612bc3c96848d48ba62a34c8c3fbd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/uk_map_outline.pdfIn PDF document text
    • http://zapibesug.epizy.com/distance-time_graphs_worksheet_answer_key.pdfIn PDF document text
    • http://mafuwiwoxosom.rf.gd/kenmore_sewing_machine_385_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/muriverozanigi.pdfIn PDF document text
    • http://generesowusavev.rf.gd/90042657743.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/oracle_sql_developer_data_modeler_for_database_design_mastery.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/motorola_pr400_programming_cable.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_77281c4a21ea4f58ad93350e2ef4a4ff.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 5356 bytes
SHA-256: dbd46844f495f000ec3841b3bbbac7afb3ccfc02cf97bda2b7171dc7297d7509
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 10028 bytes
SHA-256: cbe944aad2972c40947cf508a4b27a60da20083ed2a35fa44d31570e5b64e011
font_02_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c