Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b21df376fd4d760…

MALICIOUS

PDF

136.0 KB Created: 2021-03-18 05:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 72381b5219da3e7873d3e1707da15873 SHA-1: a47b5b31039e0be15c1054fee9be72e66d369a9b SHA-256: 6b21df376fd4d76015917e993be877290ccf1c48eff1fc28096065b98035d6e9
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a deceptive user interaction. The document's primary function appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=hand+lines+reading+in+hindi+pdf+free+download PDF link annotation
    • http://sugoxebojun.getenjoyment.net/jivim.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/zen_mind_beginner_s_mind_suzuki.pdfIn PDF document text
    • http://nugawijuxuv.mywebcommunity.org/bhagavad_gita_book_in_kannada.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/86017344004.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/here_comes_the_sun_fingerstyle_tab.pdfIn PDF document text
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/nofefurovete_firadavipa_mivulib_sajaxal.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/dOhg9hh/5260133439.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/personal_balanced_scorecard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_600c5387b4bbd.pdfIn PDF document text
    • https://pukegivox.weebly.com/uploads/1/3/1/8/131856392/bivelizim_kadilokexen.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/Lhhcjhg/ultimate_car_driving_simulator_for_pc.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/182be9.pdfIn PDF document text
    • http://vutunema.mypressonline.com/accountancy_project_class_12.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/JieEkjg/57611731353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_6049a80aca4ac.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b175a62-8f9a-4c82-9bca-abe9cdc21b42/how_to_install_autocad_mep_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bfe578-5700-44cd-9803-18498df6b536/57257215398.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a7c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A7C3 13964 bytes
SHA-256: 33d6176367545bfb9350f9e1190ce2d0350a1dad680703d061959c278999b34d
font_00_sfnt_off00014d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 11156 bytes
SHA-256: 9f21fc625ed8e0b91a2df81b3a25afb3b8db29b5a736b6fd7b6f9ac0b533fac5
font_01_sfnt_off000171aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AA 5356 bytes
SHA-256: 81e52e3c191e107013a9cc621dc3b343defc684fb3e10b1117411646df1a7671
font_02_sfnt_off000183e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E5 11564 bytes
SHA-256: 239d1a32feccd20309e5f3c5bb0574f2c963e31a921439abf0aebc235484774f
font_04_sfnt_off0001ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED9 15288 bytes
SHA-256: ce9b1e0cba5c4e47816026ae1b65535e153f430a45decf8a6b802fc22efe9b88
font_05_sfnt_off0001fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDF2 5640 bytes
SHA-256: eefdbd8a991f5f9da42f9ae4e8e68db1163b6d4dd58b0924c8b308be97396286