Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63ce93e07557b80…

MALICIOUS

PDF

80.9 KB Created: 2021-04-30 01:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6264cb68c4c746408e6c7817a2857b79 SHA-1: 50ac2f93680b6aef6f8bae30441b55178e84b9cb SHA-256: e63ce93e07557b80f67e9e9578d806ccb42992c458497fdd777cd25fce355504
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, indicative of a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=sony+str-dn840+dolby+atmos PDF link annotation
    • https://wixapikolomuv.weebly.com/uploads/1/3/4/7/134746431/dugatadutefi_givivikukisu_setojumone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_5fe6720e164fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_602088691b3a8.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/jogagorimif-dominelelon-rivukuzi-bukod.pdfIn PDF document text
    • https://tuwowezofe.weebly.com/uploads/1/3/0/7/130775341/8081435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_6017c613452d0.pdfIn PDF document text
    • https://juvobekini.weebly.com/uploads/1/3/4/3/134384538/7711592.pdfIn PDF document text
    • https://cdn.sqhk.co/binuwaxe/hihjtYX/speed_boats_for_sale_menorca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478688/normal_5fc7025a7a73f.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/hgaQWjh/11087122754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_605882d4a2fa0.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/NSTpibZ/fake_call_plus-_prank_call_app.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/wupulofaneja.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/tMqEphj/54632949445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b17f29-43ee-4bb1-8745-8d2a9f727a44/the_little_book_that_beats_the_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6954f0f-8d43-4d14-beea-871fec9f3efe/86746752776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b288bc-2421-4962-bcc4-6b16b26ec9f1/ralupoxixepuzadapej.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_302788605ae84bdc87c3dbd65ac1b1fa.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_974704d60e0c48d4b69bf7a8e3fe9f86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d842da3-c4ae-479a-b37b-2f1542a5b680/how_to_program_my_harbor_breeze_fan_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ed350c-ac60-413c-8d7d-06b3269af570/the_open_window_by_saki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e5ca74-728c-416e-a8d2-7380cb63316d/47228947419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b2694e-91ae-4cb3-8105-6230051419d5/64467761473.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 5772 bytes
SHA-256: 3536a5eec09359f443a1dcba04f42d14b7c583a045047ae5da6db772ddf22a2e
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 12924 bytes
SHA-256: d7030f05b895959d2229d3fb7c0992c12a7342cd90df3d5933b59fa444d88d50