Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa71543bd84c7b9…

MALICIOUS

PDF

86.7 KB Created: 2021-03-31 03:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 77ff72563e0e887aabc1e227caa1a9f8 SHA-1: c79ed0e3a766400ae2eb3a7c1e3d855f2d6b6cf2 SHA-256: ffa71543bd84c7b91593f382f00bd8946284076516f4016880add5e6be608908
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs pointing to suspicious domains, including one identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://ponafet.ru/award?keyword=english+nursery+rhymes+lyrics+pdf PDF link annotation
    • http://passive-income.ru/kick_the_buddy_forever_hack_mod_apksz3gf.pdfIn PDF document text
    • http://naturmilans.fun/fopodoxuzuniwisaposo402qq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_601dc90c96404.pdfIn PDF document text
    • http://prizinsta.site/toca_boca_secrets_citymyp10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_601ed72aa8f0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_6002a700b3c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_6020d0d10d59b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452374/normal_5ffe547013fff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fd040e57ee5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_60123ee1758c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_6009dc89cf370.pdfIn PDF document text
    • http://voiprormul.xyz/20547788036bdjt2.pdfIn PDF document text
    • http://axecheat8.xyz/advertising_agency_html_template5sa4w.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://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_1ffae03adb3b4462b1d4281c6cedc5ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/821867a9-1b14-42db-9f4d-cb08306c53fb/93573498578.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_154917b223444ef7ba74957244a4e740.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_bcbe5adaaa8b4319b60dcbaf04574185.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_306a3d18f35a4069a45948341baf4336.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fe93ad-dc5c-49c5-9ed3-c80870174bcc/hallmark_movie_unleashing_mr_darcy_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bed741-b217-40c7-bc0d-a235bc0a1b64/mososipojetaxewiruwomoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533691ca-0189-4847-8e03-8e56c26117f2/48044305586.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 5112 bytes
SHA-256: 545eb1d237044c621d58a79805284a515f9ffacbbc847866a0edf529384a7e86
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 11080 bytes
SHA-256: ff1ac5ba72f60f1a6dc6c94d0e016d7689383599f5b0c61cb719623cda874af0
font_03_sfnt_off00013e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c