Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ce200acd2eb2f2…

MALICIOUS

PDF

78.7 KB Created: 2021-03-18 17:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e21aa980e3e7a2bd68c1ff59ec37beaf SHA-1: fcbec9eef46660ec68a1ed1283a2669dd4db814c SHA-256: 16ce200acd2eb2f21b523969dba4721a51f3238fd78ed1cd2be5e565a3c3a934
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+get+fluval+406+started PDF link annotation
    • http://pusolaxunu.66ghz.com/aprender_italiano.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/gabari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5fd279c3f2f6c.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/95872670519.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/lodukazanutozegusabatoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_601de6c41ae41.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/accouchement_du_siege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fee296fbcf17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456369/normal_5fee673fc8340.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/5f8caaef-1829-4ae7-ac6b-102aa991e643/tenobaxomikut.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_303ace553aad477b8a48e5ac4b6c26bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f279af69-feb6-4377-b74d-2fb8ade03bf3/39041913610.pdfIn PDF document text
    • http://mijuguxugatuk.epizy.com/dcms_report_module.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb46495a-209e-4783-9cdb-c32c8a62d9e9/what_are_the_types_of_hypertext.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef4beec-8b62-4b36-9b17-9439268bb3d6/forrest_mims_electronics.pdfIn PDF document text
    • http://zimipasazodid.rf.gd/monedeb.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/22786025163.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/98515966883.pdfIn PDF document text
    • http://jopokodex.rf.gd/best_books_for_11_year_olds_2015.pdfIn PDF document text
    • http://fosekor.epizy.com/dotivoxosofuguvoko.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_b32b80476187497b838389d8c8e92d2c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 5572 bytes
SHA-256: ad27e54b723fd7c49ebab2a49e4f66911b6091e2a454f2e692343c0f05e3e3ba
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 11028 bytes
SHA-256: 5a0f1bb7dac49b27540ff2de67506bab6ae6c3e916ad84ae89d50a783b1cbe0c