Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bad6cc2c38afbf…

MALICIOUS

PDF

94.4 KB Created: 2021-05-17 00:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4c51235a2e2603d5abc5842bf0827972 SHA-1: 6e570dbfc6e066ae40cd2d891983b586c8baebf8 SHA-256: 27bad6cc2c38afbfdaa8bdc3c79019a1425c2543a99d8d4bb4aacd919520e1da
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=adobe+lightroom+classic+2020+system+requirements PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366976/normal_603ede7ea5e92.pdfIn PDF document text
    • https://teraxawazolazov.weebly.com/uploads/1/3/4/3/134386914/dojevoguvizotuv-fevat-pevizitikun-lekimawukanus.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/carrageenan_properties.pdfIn PDF document text
    • http://juxoxelobonoje.22web.org/76410855732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_5ffabb4584eae.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/deduw-wipuwidoteg.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/ef709a1.pdfIn PDF document text
    • http://ludokebisiw.iblogger.org/abp_maza_reporter_contact_number_pune.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/3284850.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/7f7610efb52f.pdfIn PDF document text
    • https://jesuzexujugom.weebly.com/uploads/1/3/0/7/130776612/c2fdce72e3a2.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/dudakevan_pemasul.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/sol_marksheet_download.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/purunajefutoxumono.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
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_d03a61a645f94e3d8b423180418187f3.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_2cde325f45104dfa956d9936b6882563.pdf?index=trueIn PDF document text
    • http://bufizufidubak.rf.gd/6325209497.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/zimojufepemedogosazejava.pdfIn PDF document text
    • https://0a6609f8-ec05-4c06-9017-86806a0ecaf5.filesusr.com/ugd/a9248e_7c5aa3fa871c43d689666dbe6ceb27f4.pdf?index=trueIn PDF document text
    • http://lodemeralakutox.epizy.com/97477751912.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011776.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11776 15276 bytes
SHA-256: 5e42503e25e2dc37de1549a56371cb234c17dba692ebae794d69025efbc60e88
font_00_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 5684 bytes
SHA-256: c513d0348616ec4b09e3a934485f461f39dfeb84c8cdd714488db0a27eb1dce8
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 5984 bytes
SHA-256: b5e2f737b44195e4b4ca7ebb91575301b7531192bfb3995b955016bbfa12e22e
font_03_sfnt_off000141e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 11720 bytes
SHA-256: cd88984439446f2eb514bf11d6203bd05d4ad1e434d1361d0e967748cd779423

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