Malicious PDF — malware analysis report

Static analysis result for SHA-256 953278fa3907e084…

MALICIOUS

PDF

88.0 KB Created: 2021-05-24 07:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3e9dd16109b0feac4385efccb2707c12 SHA-1: 26bfc92aceb8852ee41635e65f277c938e233f08 SHA-256: 953278fa3907e0844580b412f3581071c9fc51abee7a0d7b183d7f8a910abaf4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=the+economist+magazine+april+2020+pdf PDF link annotation
    • https://zerebutaravuna.weebly.com/uploads/1/3/5/9/135965874/xixavuluvovajuneg.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/2398426.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/c7b2632.pdfIn PDF document text
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/8758010.pdfIn PDF document text
    • https://mifeweravu.weebly.com/uploads/1/3/0/8/130874314/rezafane.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/20574f.pdfIn PDF document text
    • https://dikozawurizid.weebly.com/uploads/1/3/1/6/131637316/jaxafajisabir-fitetebizilo.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/bamobavuzesapa.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/sojofufawegit.pdfIn PDF document text
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/dukuziwizab_dedikarixatete_nopemol.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://s3.amazonaws.com/wefadep/15577530628.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/80679356560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4fac27-32fb-446c-89ce-2aa04bb8dff6/how_to_draw_from_photo_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5644da34-65b2-4486-abf9-45e148a47b0e/80843279368.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/what_is_the_meaning_behind_the_poem_my_papas_waltz.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/is_exaggeration_a_rhetorical_device.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a900c8-af67-4a12-ac6b-b322b6f9b891/55714521098.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/sujolumavewovobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9c9aa7-25a8-4b7a-abdd-faa0d84cfe4e/wigeburozonanerutuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f2c29e-eb18-4268-ab39-27fb5015d3f6/riso_service_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942b82df-7494-4bcf-b1ac-836a24e7601a/zupukexuwesiloju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03349db1-d7d6-4a2d-a9e1-823e77f30527/nizowo.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_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 5632 bytes
SHA-256: 6e9e0413161afa63c0fb922ada2063f7b71fe0b3e51fe590d4ad195062dc8ba5
font_01_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 13144 bytes
SHA-256: 9f9caaeae98746420c133496df83c79afc488db538256abba286a23141d9154e
font_02_sfnt_off00014460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14460 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176