Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4aa139f0e2e200…

MALICIOUS

PDF

153.3 KB Created: 2021-03-21 10:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 884d972f5ffdbde83b14efde25702a58 SHA-1: 5937d0c9fb3cf91303edd2dc014a5373c9ae5cf7 SHA-256: 1a4aa139f0e2e2009748bf54a52fc569b48cbaa032d099dc9b56a5a29ebcf341
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'bologen.ru', which is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'constitution worksheet answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://bologen.ru/wix?keyword=organization+of+the+constitution+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5fdc51ebb54a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_6047e85292de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_604680e746872.pdfIn PDF document text
    • http://begdas.fun/11660730743pm8bq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fc87d948ea01.pdfIn PDF document text
    • http://burrrhey.tech/zevexutev23rlx.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/xelipagewiwano.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/how_to_calculate_percentage_strength_of_h2o2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5fc747b829877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504554/normal_5fee3a4069af6.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/86dc1abe-4ef2-4f7f-a733-e4ad23ee55b0/55791129241.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_e5d553feada1411f96fda6d2260fc978.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/pegireravemekexesuxopob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3b9c1c-2abe-45e0-8f74-0f60487afac2/96999044842.pdfIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_57bc9a1ec5b449ee899eede57f47adf4.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_38e2c5e8991d4122b0416aed221ae736.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/367a44b3-1b52-4074-b8b4-6ee44afaf1c6/wexetujomebuliluxenedap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8aa3a0-b927-4169-b5b8-91c07b60ff62/used_firefly_2_vaporizer_for_sale.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/apprendre_l_arabe_dbutant.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/brother_hl_2240d_drum.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BC4 5344 bytes
SHA-256: b2057d2e6d774e30471f617bf10d4ee4aad949f2f18c6e9beb6e8108e0931b89
font_01_sfnt_off00022e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E10 12028 bytes
SHA-256: db64344ace9571d586137efc17d1395b02e3c55ccdd63e1ec49d5be3f5276b49

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