Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e58a8c76418b2c…

MALICIOUS

PDF

89.4 KB Created: 2021-06-07 01:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 70327ee0deefebdc80b926bde007ecf8 SHA-1: 5e2104b9ea83f07c91cbf449abf17af014db8223 SHA-256: 16e58a8c76418b2c8a9948168fa8e5d58577f97984cb8023f726504d71acc1a6
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external websites, with one prominent URL being https://gimoguvi.ru/123?utm_term=ireport+table+design+example. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://gimoguvi.ru/123?utm_term=ireport+table+design+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381105/normal_606c593414331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383308/normal_60017217e166e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603b7af9760cb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4443802/normal_60b153d504568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_600f582805635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_603ff7c115af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500450/normal_60161eabc779b.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://metudebebi.pbworks.com/w/file/fetch/144620223/lopupevigamo.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144474822/reledakixasusapodofepid.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/fabevezudeguzilamabutare.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/63090768005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7498a9be-1863-4145-8c5c-458e4e5ddae7/notipefazupebuz.pdfIn PDF document text
    • http://lokuwulixit.pbworks.com/f/legilalolodudibadefelapa.pdfIn PDF document text
    • http://devopiporo.pbworks.com/w/file/fetch/144737727/how_to_pay_my_synchrony_bill_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68c7b96-54ff-43e1-bce3-523eead0599a/mods_for_minecraft_windows_10_edition.pdfIn PDF document text
    • http://xegosigex.pbworks.com/f/74731659367.pdfIn PDF document text
    • http://kivupored.pbworks.com/f/ebay_coupon_code_2020_reddit.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/knowledge_matters_reading_quiz_answers.pdfIn PDF document text
    • http://figinav.pbworks.com/f/kojunigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa1a909-a745-4581-9c60-54f8fcf1fe77/how_is_jesus_connected_to_david.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/kiwezu.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144752385/what_intermolecular_forces_are_present_in_nh3.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144670446/54937762007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0c4013-c241-48ba-ae07-18b397696162/how_to_make_an_appointment_to_give_blood.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010a2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A2B 14680 bytes
SHA-256: 7b8573896b1ef1a8f4bb01d6e6a6778b4c21f8486e48796c4731a3248e91b9d5
font_00_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 5424 bytes
SHA-256: fbc6e89571c42eb434e25329c0dffdc2fbf233c905219e325bf76d174c923bc0
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 10988 bytes
SHA-256: 1d3fcae8ba63265be622e3e42a08bd8f1253314fed71ee731d2f2c94ad976cb6