Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62dcc2f94db1077…

MALICIOUS

PDF

90.2 KB Created: 2021-03-23 05:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0989bd87b8354a4290d9245550297491 SHA-1: aea7ec365767d816ec4749e7188219ae4d61e122 SHA-256: d62dcc2f94db10773ba453e487dbae4a596e8de9346ec0d57d35b479f7977179
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to create a large number of links on potentially malicious or low-reputation domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maypoin.ru/wix?keyword=algebra+2+chapter+8+answers PDF link annotation
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/viluveselete.pdfIn PDF document text
    • http://panikovo.iblogger.org/pet_sematary_cat_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_600b77ac947a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5fc65776a595d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_601fffb8e11f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_6018240cdec0c.pdfIn PDF document text
    • https://bizudabug.weebly.com/uploads/1/3/4/7/134722823/2455873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_5ff6d09637cc1.pdfIn PDF document text
    • http://dejenenipanoz.22web.org/spreadsheet_match_two_columns.pdfIn PDF document text
    • https://sivekilupikuma.weebly.com/uploads/1/3/4/4/134491743/sisixulevelajux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_6044991591562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_603887af0ac4a.pdfIn PDF document text
    • https://fevujuwevu.weebly.com/uploads/1/3/0/8/130813851/meravurakev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5ff2c0207322f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fdc14cb7d70b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382406/normal_5fe1840790d27.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/4b8b2e14-51ed-456e-a502-9b2d5a0135e2/25191724764.pdfIn PDF document text
    • http://banidokote.epizy.com/hv_800_hardness.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_72a30b17ad064731a08e890429a339b3.pdf?index=trueIn PDF document text
    • http://miduzusajaveg.rf.gd/fitbit_versa_lite_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a0a40b-d528-4cdb-a3bb-c43b11b67dd9/nuvogimibilukurog.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_152c6a025d9c487f929d697f8861a36e.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_e8966d96c64b4cb9a58ff09a8e121c07.pdf?index=trueIn PDF document text
    • http://zinezalidoratov.rf.gd/7817712129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf35f17-8a89-4d44-8e3d-a93335951f16/bpsc.bih.nic.in_admit_card_2020_download.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_c37c8e21eb9e4721a2e26c5cd1d88d25.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_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 3396 bytes
SHA-256: 9497a9e00b0c5b79f080cf8d3754bb37a3f581e24546e3c1e7ff90405cd0f4f3
font_01_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 5744 bytes
SHA-256: 9c72928272aa956a9fe116c5ab210ab5e2a96da779efd14313dba95449e092cc
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 10304 bytes
SHA-256: 0ea308ff9bf0b843490dbe22d3b5b050914eddb02830ed7256dfeabd4eb38c83